Buggy and unstable. I spent quite some time investigating Xamarin vs Flutter for my app, and ended up choosing Flutter simply because Xamarin was so unreliable.

No regrets whatsoever. There's no two ways about it - Flutter has already won the battle.

In fact, it hasn't just won the battle, it's already sitting in a spa celebrating its victory with bottles of champagne.

Use it quite often and enjoy it. Biggest reason is because I love C#/.net. Only recently been using Xamarin.Forms, which seems to finally be getting to a pretty mature state. They’ve made it a lot easier to jump in/out of Xamarin.Forms and Xamarin native within the same app. Also recently added Hot-reload features to compete with flutter. However, Flutter feels like it’s ultimately going to take over this space for “native” cross platform development. More momentum and less baggage. I have noticed Xamarin seems to be better about incorporating community feedback since flutter became its primary competition. Flex layout, Shell/route based navigation, etc. seem like responses to flutter features. Xamarin is great for C# fans but probably won’t win over many others outside of that with flutter as the alternative.

Haven’t used it myself, but a dev I really respect loves it. With better handling of null in v. 8, C# is legitimately one of he best mainstream languages.