Flutter or react native or ionic

I saw a guy who has been writing code in flutter for last year, write a perfectly good code in react, and also writes backend java, kotlin, makes PRs to OSS. He's seemed like a nice guy. Not loud, but does great work.
It's not the framework

Flutter

Flutter is nice but 3P library support is a bitch, I’d say stick to react native, if your web is on react then you can move components from web to mobile :)