Comment by somat

It is situational but I think on a modern wide screen(or screens) if it is a single text-like document(like a web page or a terminal) you want 2 or perhaps 3 side by side. if the app implements it's own window management(like blender) a single full screen is best. Overlapping windows are important to have, but almost never desirable, it usually happens because you ran out of room.