React 19 introduces new hooks and features for data handling, performance improvement, and better developer experience.React 19 hooks like useActionState, useFormStatus, and useOptimistic simplify common patterns in React development.React Query (Tanstack) provides advanced caching, automatic background synchronization, query invalidations, and error handling for complex scenarios.For simpler use cases, React v19 hooks can be used, while Tanstack Query is recommended for larger applications with complex data tasks.