Godot is OK, I really don't like GDScript and as far as I know its 3D support is lackluster. I check the Godot subreddits now and then to look at projects and nothing is really impressive.

In my opinion, if "open source" is a necessity, then Godot currently seems like the leader in terms of community support and maintennance, otherwise I'd suggest going with Unity, even for 2D, and waiting until Godot's featureset matures a bit more.