Can I integrate ERP (NetSuite, SAP, Odoo) on each?

Both can, different paths.

Shopify ERP integration: mostly through middleware (Celigo, Workato, Boomi, MuleSoft) or app-store connectors (e.g. Alumio, Patchworks for NetSuite). Pros: connector vendor handles the schema diffs and auth refreshes. Cons: middleware costs $400, $2,500/mo indefinitely, and custom field mappings often require a service-desk ticket. Real-time sync is rare; most are 5-min batches.

Magento ERP integration: direct API integration is the norm. Magento’s REST + GraphQL APIs cover orders, customers, inventory, products. Custom modules can expose ERP-specific webhooks. Pros: no middleware tax (one-time $20k, $80k dev cost), real-time sync is achievable, full control over data shape. Cons: you own the integration, when SAP changes its IDoc format you’re the one fixing it.

Rule of thumb: under $5M GMV with standard ERP setups → Shopify + middleware is faster. Above $5M with complex SKU master data, multi-warehouse inventory, or IDoc-based SAP → Magento direct integration is more reliable and 3-year-cheaper.