I think in the long term Flutter would be your best bet, I work with both flutter and react native daily and I am constantly finding reasons why flutter is better then RN, some general things I've found with flutter are the following:
- User base is growing massively and a lot of companies are switching over to flutter
- Performance is much better than React, both usage and compile times.
- Managing framework updates with Flutter is a breeze and not so great with React.
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