Board Thread:The Flash discussions/@comment-1827503-20151104011533/@comment-807326-20151104040319

I think the way "Earth Two" was presented is a bit more official than "Earth-2". We got the latter from a quick scribble from Professor Stein, yet the former was actually subtitled in, so I think that's a tad more appropriate to use, even if "Earth-2" is usually more popular.