Faster and better in almost every respect we've looked at vs React Native or Electron. We're super happy with this choice we made quite some time ago.

I'm not qualified to give an in depth review/comparison, however.

Edit: we use flutter to build an app which runs on iOS, Android, macOS, Windows and Linux -- the same code base with pretty minor adaptations to desktop vs mobile and different screen sizes.

The experience has so far been fantastic. It's fast, it's relatively light weight, it's performant, it's a pleasure and we couldn't imagine doing it any other way.