So I really want a Keyone and I don't have one yet. Currently, I'm using an Iphone 6plus. I was looking at getting the black edition because 64gb and 4ram.. but I have at&t and they have the black colorway of the standard keyone. The at&t version is cheaper. My question is...is getting the black edition worth it? Or should I just get the black at&t keyone and save some money? performance wise is there is big difference?