Below are concise, user-review–based summaries for top B2B e‑commerce platforms (based on recent reviews from G2, PeerSpot/Peer Insights, TrustRadius, Capterra and vendor press). For each platform I list the common pros, common cons, and one or two representative review sources so you can drill into more detail.

1. BigCommerce (B2B/Enterprise)

• Common pros: Easy-to-use admin, strong native B2B features and ERP/OMS integrations, good multi-channel support, strong customer support. Users praise out‑of‑box B2B capabilities and extensibility. (g2.com)
• Common cons: Page-builder/front-end limitations unless you go headless; some customization/workarounds required for advanced flows. (g2.com)

2. Shopify Plus

• Common pros: Fast to launch, intuitive UI, excellent ecosystem of apps and partners, strong automation tools (Flow, Launchpad), good multichannel/selling features. Users like operational simplicity and speed. (g2.com)
• Common cons: Enterprise/custom B2B functionality sometimes requires apps or custom work; can be pricey for enterprise use and is opinionated (Liquid) so deep backend access is limited. Reviewers report mixed enterprise fit. (g2.com)

3. Adobe Commerce / Magento (Adobe Commerce)

• Common pros: Very flexible and feature‑rich (catalog, pricing, promotions), large ecosystem and extensions, strong for complex B2B customizations when you have dev resources. (g2.com)
• Common cons: Heavy implementation and maintenance effort, security/patching and upgrades can be challenging (recent security incidents reported), and total cost/operational overhead is high unless you have experienced teams. (techradar.com)

4. SAP Commerce Cloud

• Common pros: Enterprise-grade functionality (catalog, complex pricing, multi-site/multi-currency), deep ERP integration with SAP landscape, scalable for large B2B operations. Reviewers value robustness for complex enterprise use. (peerspot.com)
• Common cons: High cost, steep learning curve, long implementations, and reviewers cite slower onboarding and complex customizations; support/response and documentation sometimes criticized. (peerspot.com)

5. Salesforce Commerce Cloud

• Common pros: Strong omnichannel and personalization capabilities, tight integration potential with Salesforce CRM/Service clouds, stable SaaS experience and good scalability for retail/commerce. Reviewers praise reporting, personalization, and integration with the Salesforce suite. (peerspot.com)
• Common cons: High TCO (licensing and revenue-share models), complex integrations for some B2B flows, steep learning curve, and smaller companies may find it cost-prohibitive. (peerspot.com)

6. commercetools (headless / MACH)

• Common pros: Modern, API-first (MACH) architecture, very flexible for headless/composable B2B builds, excellent APIs and developer documentation; reviewers appreciate speed and capability for custom experiences. (g2.com)
• Common cons: Requires committed development resources (headless builds), some core B2B features (order management, returns) may need additional components, and reviewers note integration/connectors and pricing as considerations. (g2.com)

7. OroCommerce (B2B-focused)

• Common pros: Built specifically for B2B — native B2B features (quoting/RFQ, complex pricing, multi-buyer workflows), flexible and feature-rich for distributors/manufacturers; reviewers like its B2B-first design and built-in workflow/CRM capabilities. (g2.com)
• Common cons: Implementation complexity, steeper learning curve for non-technical users, UI/UX criticisms from some reviewers, and perceived higher pricing for certain customers. (g2.com)

How reviewers differ (important context)

• Small/mid-market vs enterprise experiences vary widely: platforms that reviewers love for ease (Shopify Plus, BigCommerce) can feel limited for very complex B2B needs; conversely, enterprise platforms (SAP Commerce, Adobe Commerce) are powerful but require more time, budget, and technical resources. (g2.com)
• Headless/composable platforms (commercetools) get high marks for flexibility but assume you have engineering capacity. (g2.com)

If you want next steps

• If you tell me the size of your business (SMB, mid‑market, enterprise), your top 3 must-have B2B features (examples: contract pricing, account hierarchies, quoting/RFQ, punchout, ERP integration), and whether you prefer SaaS vs. self‑hosted, I can:
  • map which platforms fit best, or
  • produce a short “decision matrix” comparing pricing signals, implementation effort, and expected TCO from reviewer signals and market reports.

Sources / where these review summaries came from (representative pages)

• BigCommerce G2 reviews and BigCommerce press — G2 review pages and TrustRadius award info. (g2.com)
• Shopify Plus reviews (G2). (g2.com)
• Adobe Commerce / Magento reviews and recent security reporting. (g2.com)
• SAP Commerce Cloud PeerSpot / G2 reviews. (peerspot.com)
• Salesforce Commerce Cloud PeerSpot review summaries. (peerspot.com)
• commercetools G2 reviews. (g2.com)
• OroCommerce G2/Capterra reviews. (g2.com)

Would you like a one‑page comparison table (short TCO/typical implementation time/fit by company size) for 3–5 platforms you’re considering? I can build it next.