Both frameworks have various packages that add OIDC support to them so that shouldn't be an issue. As for beginner - there's quite a bit of learning curve in t

Both frameworks have various packages that add OIDC support to them so that shouldn't be an issue. As for beginner - there's quite a bit of learning curve in terms of writing GUI applications themselves. Avalonia is kind of like WPF* but good(tm) and cross-platform. Uno platform is more like Xamarin and MAUI except in a better shape as of today. From technical perspective, Avalonia focuses on consistent rendering on all platforms with Skia while Uno tries to use native controls instead. I generally would not advise using Avalonia for mobile over Uno. In mobile case you might actually want to also give MAUI a try as, despite harsh criticism it has been receiving, it has improved significantly. * either platform supports various declarative UI libraries (that are either part of their ecosystem or community-maintained), so you are not married to XAML thankfully.