I've built several small projects in Flutter. Google doesn't Dogfood it properly, and just cut a significant number of staff working on it.

I want Flutter to succeed, but I don't have too much faith it long term. That said, if I had to hack out a quick app right now for a client I'd probably use Flutter. Development is fast and easy. You can just write code as if you're writing JS and learn a bit of extra syntax.

React Native has it's own issues, but I have more faith in Meta to keep funding it.