React Native is a more mature framework with a bigger community. This being said, while Flutter is still young, there is a lot of positive feedback coming from developers. Google seems set on pushing its framework, and it’s gaining popularity as a result. I would, however, suggest keeping an eye on both frameworks as they will be the future of mobile app development, reducing the use of Native Platform Specific code only for very special cases that result in reducing the time to market a mobile app.
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Flutter vs React Native