I don't know much about programming but I do know a little about these engines. I've heard unity is the simplest in that it's the easiest to work with. With effort some good looking games can be made in unity. Gone Home, for example. Cryengine looks great and is easily my favorite but is a lot harder to work with. I don't know much about Unreal. Good luck with your project!
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Yeah I also heard Unity is the simplest, but with Unreal Engine 4's new blueprint feature, things are a bit easier, especially for those who don't know C++, like myself.