I like Rider better even on Windows. My favorite thing about Visual Studio on Windows was always the debugger, and I think Clion and Rider have lapped them there in the past two years.

Yes it's just Xamarin modified to look like a native Visual Studio for Mac.

Much better off using Rider (also works nicely on Linux).

IntelliJ is still a little broken on wayland I think. Last I checked they were waiting on a patch to Swing, so right now it's only running under XWayland, it's fairly buggy and doesn't scale nicely. You also need to set some env variables or you'll get a blank screen. It still works pretty well though, which is better than any other similar IDE.

Seconding Rider if you're on macOS. It shares its analysis code with ReSharper, so it's extremely featureful. In fact, it's usually faster than VS + ReSharper because it isn't running two code analysis engines at once and it doesn't have to run the analysis out-of-process.