Magento REST vs GraphQL, which API should you use?

It depends on the consumer and the data shape. Magento REST API is the right call for most server-to-server integrations (ERP, CRM, marketplace sync), it’s stable, well-documented, and covers nearly the whole admin surface. Magento GraphQL shines for storefront / headless consumers that need lean, typed payloads and want to fetch exactly the fields they use in one round-trip. We design each flow against whichever fits the latency budget and payload shape, and frequently use both in the same project.