[tluyben2]

For Xamarin I would answer that with: Flutter and React native are 'light' on the developer: you get instant feedback. Xamarin, at least when we dropped it 2 years ago, was really slow and, besides c# which we will use on the server, hardly pleasant or light. I think these days, the developer needs a smooth experience (once the tons of crap has been installed and set up, which is why I prefer Flutter over react native) so things that are not that will fall over. I think, after that, comes author influence: so if you take that, you get to RN, Flutter, Xamarin, Ionic if you sort them by EasyOfDev,AuthorInfluence.