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Godot has some pretty good navigation, and it was recently re-written in GD 4.1: https://docs.godotengine.org/en/stable/tutorials/navigation/...

As for Android, I know they are still tackling C# support on Android exports, but other than that I'm not personally aware of it not being good for mobile.

I barely know anything about either engine, but why isn't it as good for mobile?

Also no C# support for game consoles.