[Arelius]

That is however a mobile game.

Unity is really nice, and if you plan for it, can scale pretty well. It's much more flexible, so it's easier to shoot yourself in the foot, while other engines are less flexible, which can be advantageous at time. Additionally, it's difficult to get it to shine at the higher end in the ways that other engines do. IMO, I think this is more of a problem of bad defaults than any significant lack of features. But the top tier games released by most of the other engine developers have really forced them to tweak the engine in ways that Unity has not.