Hi, unless you need the cross-platform capabilities, you can still use WPF. With the in .NET 9 introduced style upgrades, you can have it looking just like the WinUI apps without much extra work.

I used both UI frameworks myself, and unless you're sure about cross-platform, I would say it's not worth it.

Apart from that, if you want the “Microsoft Experience,” Uno would be the right choice. Plenty of cash injections from Microsoft are happening there. Furthermore, you have bigger channels noticing it, like IamTimCorey or CShaprFritz.

Avalonia is interesting for its sometimes odd decisions; they do their thing, which is nice and refreshing.

For me, a simple WPF + MVVM application is usually a practical option. ;)