Flutter is better than react native React Native but both have their pros and cons. Considering trends and performance, flutter is better but the adaption and job prospects wise react naïve is better. Some of the industry experts have predicted that Flutter is the future of mobile app development and has entered the cross-platform mobile development race very strongly.
You can check out this blog on Flutter vs React Native by Intellipaat to understand better.
Also, watch this video for differences: