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If you are building form apps and stuff where delivering something working is the main objective (most enterprise apps) web UI is by far the best choice - ecosystem is huge, plenty of developers and designers to hire, tools let you export stuff like styles directly from designs, etc.

If you care about user experience - writing it for each platform would have ended up being faster in the last app I did with flutter - so many subtle things that dragged the development out for weeks where as native had all these things working out of the box. I haven't worked with Xamarin in a while but I remember the quality was the worst out of all solutions I've used. So many moving parts, "this works in the latest version" and then half of other dependencies haven't been updated, and you just said the same thing.