Which S6 Edge variant should I purchase?

Hey! This is my first post on the forums, so correct me if this is in the wrong section or anything of that nature. Anyway, I've been interested in purchasing a Galaxy S6 Edge for a while now. I currently use a Nexus 4 on the daily, and I love the Edge's similarly beautiful design. I am going to buy the phone unlocked, as I have never been and will never be locked into a service contract. Right now I use Cricket Wireless in the United States. (which operates on At&t's towers). Cricket only sells the not-so-edgy galaxy s6, but I should be able to use any gsm model on the carrier. I was wondering if there are any reasons to pick one variant over another? Could the non carrier specific ones will receive updates quicker? Or maybe US specific models will operate better in the US (reception wise)? Do some get more developer support from the community for rooting and rom development? Is there even a difference (perhaps not)? These are all just random examples that come to mind. I just want to make sure I'm not hit with any curve ball when making such a large purchase. In any case, it's sure to be an upgrade from 2012. Thanks in advance