Pros
One of Flutter’s biggest strengths is its outstanding performance. With Flutter’s reactive framework and optimized widgets, apps achieve butter-smooth user experiences on both iOS and Android platforms. Complex animations and motions can be crafted and performed smoothly across phones, tablets , wearables and beyond due to Flutter’s Skia graphics engine.
This unified engine also ensures pixel-perfect UI consistency as widgets will always render and behave the same way irrespective of platform. Flutter’s hot reload feature further aids the development process immensely. With hot reload code and UI changes made in the IDE are instantly visible without full app recompilation and restart – a real productivity boost. Overall the performance and development ergonomics are top-notch with Flutter.
Cons
While Flutter produces near-native quality apps the bundled package can be larger compared to a pure React Native codebase. The reason is that Flutter pulls in the entire runtime Dart VM along with dependencies whereas React Native relies on incremental updates to a JavaScript bundle residing within a local cache. This size difference though marginal usually is amplified for resource-constrained devices.
In addition as a younger framework, Flutter’s library and plugin ecosystem is narrower than React Native’s which has a several-year head start. Finding suitable packages handling specific native device traits like ARKit or fingerprint authentication could initially prove harder. This coupled with Flutter’s singleton package model rather than CocoaPods/NPM does pose some constraints for certain specialized use cases.