Earlier quoted context omitted.
If you want to do android development, Kotlin. If you want to do multi platform development, flutter. I think flutter will be an amazing tool for smaller teams, especially in non-tech-primary organisations. I work in the public sector of Denmark, we do in-house development, our main focus is the public services we provide though. So there is just no way we can do mobile, desktop and web without something like Flutter…
Why not React / React Native?
So on React Native you will have that abstraction layer add runtime latency and package size of your app, while Flutter (Dart) really outputs native code.