B2B Ecommerce Platforms Compared: Magento vs Shopify vs Custom Build

When Herre Roelevink founded Manifera in 2014, he noticed something that still holds true a decade later: European businesses spend enormous energy evaluating engineering talent and remarkably little evaluating the platform decisions that talent ends up executing. A brilliant development team building on the wrong b2b ecommerce foundation will still produce a product that fights your business model for years. That founding observation — that the platform choice and the team choice are equally consequential, and too often only one of them gets real scrutiny — is exactly the blind spot we see COOs walk into when they’re down to a final decision between Magento, Shopify, and a custom-built B2B commerce platform.

This decision looks simpler from a distance than it is up close. All three options can technically support tiered pricing, account-based catalogs, and bulk ordering. The differences that actually matter show up in total cost of ownership, how much your specific B2B workflows have to bend to fit the platform, and how expensive it becomes to integrate with the ERP and CRM systems your business already runs on — three factors that rarely get the same weight in a sales deck as they deserve in a boardroom decision.

Why B2B Ecommerce Isn’t B2C Ecommerce With Extra Steps

Most ecommerce platforms were designed B2C-first, and B2B functionality was added later as an extension layer. This matters because B2B buyers need things B2C shoppers rarely do: negotiated, customer-specific pricing tiers, credit terms and net-30/60/90 payment options rather than instant card checkout, complex approval workflows for large purchase orders, bulk reordering from purchase history, and deep integration with procurement systems like SAP Ariba or Coupa that your customers’ buyers already use. A platform that handles B2C beautifully but treats B2B as a bolted-on feature set will show its seams exactly where your business needs them least — at checkout, during a large negotiated order, in front of a procurement manager who does this daily and notices friction immediately.

Magento: The Established B2B-Capable Option

Magento (now Adobe Commerce) has the deepest native B2B feature set of the three, including built-in company accounts, negotiated quotes, and requisition lists, which is why it remains the default recommendation for mid-market and enterprise B2B sellers with complex catalog and pricing logic. The trade-off is total cost of ownership: Magento requires more specialized development and hosting expertise than Shopify, licensing costs for Adobe Commerce (the paid enterprise tier) run into tens of thousands of euros annually depending on revenue tier, and ongoing maintenance requires developers with genuine Magento expertise, which commands a premium in the current market. For a COO evaluating Magento, the honest question isn’t “can it do what we need” — it almost always can — but “does our transaction volume and catalog complexity justify the higher build and maintenance cost.” That question is easy to defer during a sales conversation and considerably harder to answer honestly once you’re staring at a signed enterprise licensing agreement a year in.

Shopify: Fast to Launch, Constrained at the Edges

Shopify’s B2B capabilities have matured substantially, particularly with Shopify Plus, which now includes company profiles, custom price lists, and payment terms as native features rather than third-party bolt-ons. The appeal is speed and lower initial cost — a functional B2B storefront can launch in weeks rather than months, and ongoing platform maintenance is largely handled by Shopify itself rather than requiring dedicated in-house or agency expertise. The constraint is customization ceiling: highly specific approval workflows, unusual pricing logic, or deep legacy ERP integrations can hit the limits of what Shopify’s app ecosystem and API allow, requiring workarounds that add complexity precisely where you were hoping to avoid it. Shopify Plus also carries a meaningfully higher subscription cost than standard Shopify, which narrows its cost advantage over Magento at higher transaction volumes.

Custom Build: Maximum Fit, Maximum Responsibility

A custom-built B2B commerce platform removes the constraint entirely — your pricing logic, approval workflows, and ERP integrations are built exactly to your specification rather than adapted to a platform’s assumptions. This is the right call when your B2B model has genuinely unusual requirements — industry-specific compliance workflows, a pricing structure no off-the-shelf platform anticipates, or an existing legacy system that off-the-shelf integrations simply don’t support well. The cost is that you now own the full engineering and maintenance burden that a platform vendor would otherwise absorb: security patching, uptime, scaling, and feature development all become your responsibility (or your development partner’s), rather than inherited from a platform’s roadmap. Custom builds typically cost more upfront than Shopify and comparable to or more than Magento depending on scope, but the total cost of ownership calculation shifts favorably over a multi-year horizon if your requirements would otherwise force expensive platform workarounds indefinitely.

The Hidden Cost of Getting This Wrong: Migration

The scenario that should worry any COO evaluating this decision isn’t the initial build cost — it’s the cost of discovering two years in that the platform doesn’t fit and needing to migrate. Platform migrations in B2B ecommerce are meaningfully harder than in B2C, because you’re not just moving a product catalog and order history; you’re migrating negotiated pricing agreements, active company accounts with custom terms, integration mappings to your ERP, and often mid-flight purchase orders that can’t simply pause during a cutover. A B2B platform migration commonly takes three to six months of dedicated engineering time and carries real business risk if active customer accounts experience disruption during the transition — a risk that’s considerably higher in B2B than B2C because your customers are businesses with their own procurement deadlines, not individual shoppers who can simply wait a day.

This is the strongest argument for taking the platform decision seriously at the outset rather than treating it as reversible. A Shopify implementation that turns out to need Magento-level customization eighteen months in, or a Magento build that turns out to be overkill for a business that could have shipped faster and cheaper on Shopify Plus, both end in the same expensive place: a mid-life migration that costs more than doing the analysis properly the first time would have.

Three-Year Total Cost of Ownership, Roughly

To make the comparison concrete, a mid-sized B2B seller with a moderate catalog (a few thousand SKUs) and a few hundred active company accounts might expect roughly the following three-year totals, combining build, platform fees, hosting, and maintenance: Shopify Plus typically lands in the €90,000-€160,000 range over three years, reflecting lower build cost and bundled infrastructure but an ongoing subscription premium; Magento/Adobe Commerce typically lands in the €150,000-€280,000 range, reflecting higher build complexity, separate hosting costs, and enterprise licensing fees at scale; a custom build typically lands in the €140,000-€250,000 range for the initial build and first two years of maintenance, with the caveat that this figure is the most scenario-dependent of the three since a custom build’s cost is entirely a function of your specific requirements rather than a platform’s pricing tiers. These ranges are directional rather than a quote for any specific business, but they illustrate a consistent pattern: Shopify’s advantage is real but narrows as B2B complexity and transaction volume grow, while custom builds become relatively more competitive as requirements diverge further from what any off-the-shelf platform assumes.

A Framework for the Decision

Start with transaction complexity, not brand familiarity. If your B2B sales process is relatively standard — tiered pricing, company accounts, bulk ordering, integration with a common ERP like NetSuite or Microsoft Dynamics — Shopify Plus or Magento will both likely serve you well, and the decision comes down to budget and timeline: Shopify for speed and lower total cost, Magento for deeper native B2B logic at a higher cost. If your business has requirements that don’t map cleanly onto standard B2B ecommerce patterns — a highly specific approval hierarchy, an unusual pricing model tied to contract terms rather than simple tiers, or integration needs with a legacy system that lacks modern API support — a custom build, while more expensive upfront, avoids years of fighting a platform that wasn’t built for your business.

It’s worth stress-testing this decision against your growth plan, not just your current state. A platform that fits your B2B model today at 500 SKUs and 200 active accounts may become genuinely constraining at 5,000 SKUs and 2,000 accounts, particularly on the Shopify side, where certain performance and customization ceilings become more apparent at scale. Ask any vendor helping you decide to model the platform’s behavior at your projected three-year volume, not just your current one, and ask them to be specific about which features would need to change, not just reassure you that “it should scale fine.”

The Team Question Nobody Asks Early Enough

Here’s the part of Herre Roelevink’s original observation that still gets overlooked in most B2B ecommerce decisions: the platform is only half the equation, and the team implementing it is the other half. A perfectly chosen platform, built by a team unfamiliar with B2B-specific patterns like tiered pricing logic or approval hierarchies, will still underperform a slightly less optimal platform built by a team that has done this exact type of implementation repeatedly. Before finalizing your platform choice, ask each vendor on your shortlist how many B2B — specifically B2B, not B2C — implementations they’ve delivered on the platform they’re recommending, and ask to speak with a client whose account volume and catalog complexity resembles yours. A vendor with broad ecommerce experience but limited B2B-specific experience will often steer you toward the platform they know best rather than the one that best fits your actual business model, which is a subtle bias worth actively guarding against during your final vendor conversations.

What This Looks Like in Practice

Manifera brings full-stack capabilities to webshop and eCommerce development engagements — frontend, backend, payment gateway integration, and ERP/CRM connectivity handled under one team rather than coordinated across multiple specialized vendors, which matters considerably when a B2B platform decision involves deep integration work regardless of which of the three paths you choose. With 160+ delivered projects and 120+ clients served across SME and MNC clients over more than a decade, we’ve built and migrated B2B storefronts on all three platforms discussed here, which means our platform recommendation to you is grounded in comparable prior engagements rather than a single default we push regardless of fit. You can see how this has played out for other B2B sellers in our portfolio.

Questions to Ask Before You Commit

Ask each finalist to model your specific pricing and approval logic on their recommended platform, in writing, before you sign — a generic “yes, that’s supported” answer in a sales call is not the same as a documented implementation plan. Ask what happens if your ERP or CRM changes in two years; how portable is the integration layer, and is it built using standard APIs or platform-specific workarounds that would need to be rebuilt from scratch. And ask for a realistic total cost of ownership over three years, not just the initial build quote, including platform fees, hosting, maintenance, and the cost of any workarounds required to fit your specific B2B requirements onto the platform being proposed.

Finally, ask what a mid-implementation pivot would look like — not because you’re planning one, but because the answer reveals how much the vendor has genuinely thought through the platform’s boundaries versus how much they’re simply confident it will work until proven otherwise. A vendor who can describe a concrete contingency plan, including roughly what it would cost and how long it would take, is demonstrating the kind of operational maturity that matters far more over a multi-year B2B relationship than a confident answer in the initial sales call ever could.

See how we helped B2B distributors modernize their ecommerce stack in our portfolio, and reach out when you’re ready to model your specific platform decision against real numbers rather than a generic comparison.

Integration Cost Breakdown: What Each ERP Connection Actually Adds

The three-year totals above hide a variable that swings the final number more than platform choice alone: which ERP you’re connecting to. A NetSuite integration using its SuiteTalk API typically adds €15,000-€30,000 to a Shopify Plus or Magento build, since prebuilt connectors handle most of the mapping work. Microsoft Dynamics 365 Business Central sits in a similar range, €12,000-€28,000, thanks to mature Power Platform connectors on both platforms. SAP is the outlier: a genuine SAP ECC or S/4HANA integration for order sync, inventory, and pricing commonly runs €40,000-€90,000, because SAP’s data model rarely maps cleanly onto ecommerce order structures and custom middleware (Dell Boomi, MuleSoft, or a bespoke integration layer) is usually required regardless of which storefront platform you pick. A legacy, on-premise, non-API-first ERP pushes this higher still, sometimes exceeding the storefront build cost itself.

The practical implication: if your ERP is SAP or a legacy on-premise system, the platform decision (Magento vs. Shopify vs. custom) matters less to your total budget than the integration layer does, and you should get a fixed-scope integration quote before you finalize the storefront choice, not after. Ask any vendor to name the specific middleware they’d use and whether they’ve built that exact ERP-to-platform pairing before — “we can integrate with SAP” is a claim every vendor makes; a named prior SAP-to-Shopify or SAP-to-Magento project is the evidence that separates real experience from a capability slide.

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