The top B2B e-commerce platforms today include Shopify Plus, BigCommerce, Adobe Commerce, Salesforce B2B Commerce Cloud, Oracle NetSuite Commerce, SAP Commerce Cloud, commercetools, OroCommerce, Elastic Path, and Sana Commerce, and they differ mainly in architecture, integration depth, and enterprise scalability. Shopify Plus and BigCommerce are strong for fast deployment, bulk ordering, custom pricing, and easy ERP/CRM integrations, making them ideal for SMBs and mid-market companies. Adobe Commerce, SAP Commerce Cloud, and Salesforce Commerce Cloud are enterprise-focused platforms offering advanced customization, contract management, complex catalogs, and deep system integrations. Composable and headless platforms like commercetools and Elastic Path excel in API-first flexibility, scalability, and modern omnichannel commerce. OroCommerce and Sana Commerce are especially strong for manufacturers and distributors due to tight ERP connectivity and B2B-native workflows. Overall, startups prefer Shopify Plus or BigCommerce for simplicity, mid-sized businesses value flexibility and integration, and large enterprises choose Adobe, SAP, or Salesforce for complex global B2B operations with high security, analytics, and scalability needs.