There is no single 'best' architecture. The right choice depends on your data complexity and your clients' needs.
1REST: The Reliable Standard
REST is simple to cache, easy to debug in a browser, and has massive ecosystem support. If your app is a simple CRUD application, REST is often the fastest way to build.
2GraphQL: The Client's Dream
GraphQL is perfect for mobile apps or complex dashboards where you need data from many sources in a single request. It eliminates versioning and makes frontend teams much more autonomous.
3The Trade-off
GraphQL adds complexity to the backend (Resolvers, Schemas) and makes caching more difficult. REST adds complexity to the frontend (Multiple requests, complex data mapping).
