I've shipped Unity games, and had impact on some engine decisions for major companies (between Unity, Unreal, and a few others). Unreal is a FPS engine with a

I've shipped Unity games, and had impact on some engine decisions for major companies (between Unity, Unreal, and a few others). Unreal is a FPS engine with a gorgeous renderer. Unity is a rendering pipeline, physics engine, with a C# interface. Are you making a movie? Unreal. Making a FPS (or third-person, I guess. an ego shooter? whatever.) Unreal. Making literally anything else: Unity. It's that simple.