Why is Unity the most popular engine?

I’ve seen high-quality stuff done in Unity on par with Unreal/CE if not better. And yes, she’s a real diamond in Unity’s tool belt so expect even more. The biggest advantage of Unreal vs. Unity at the moment is that Unreal is artist oriented whereas Unity is programmer oriented. It is something that Unity want to address with upcoming Unity 2017:

Competition is always to the benefit of us :slight_smile:

The real battle now is between Unity and Unreal and Lumberyard playing a catch-up game.