Centimeters for Unreal. I remember a while I ago I forgot to switch my unit setup from imperial to metric. I didn't realize it until after I imported a modular mesh to Unreal. It was the size of an ant.
I started modeling working in inches because of the Source engine, but I've since learned to interchange between centimeters when I'm doing external work and decimeters when I'm doing personal projects. Since it's a decimal place away from unity in one direction and unreal in another, it's an easily interchangeable…