Flutter is the worse in terms of code aesthetics. What React can express in 4 familiar lines of CSS-like properties and a View (aka a div), Flutter does in 4 nested OO classes. And the global state management packages and ways to inject code are also gross compared to RN hooks. For me RN's biggest pain point has been upgrading, hopefully that will get better as new arch becomes norm.

I wanted to like Flutter as I think the arch of directly drawing to a canvas is better, though RN new sync non-serializing arch between it and native components should help things. But it/Dart was made by some Java loving punks who went OO mad. I wish it was written in a better, faster language like Go.