On Windows, likely WPF on .NET Core. I'm not familiar enough with the other UI frameworks to say I'd pick them over it. Definitely wouldn't be Windows Forms. Once you've mastered WPF, you don't want to go back. Well, at least I don't. :D
With that said, nowadays the browser platforms are so powerful that I'll pick that over a desktop app. The only reason I'd go for the desktop is if the application just isn't suitable for a browser environment.
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On Windows, likely WPF on .NET Core. I'm not familiar enough with the other UI frameworks to say I'd pick them over it. Definitely wouldn't be Windows Forms. Once you've mastered WPF, you don't want to go back. Well, at least I don't. :D
With that said, nowadays the browser platforms are so powerful that I'll pick that over a desktop app. The only reason I'd go for the desktop is if the application just isn't suitable for a browser environment.