People here have gotten several Hypertech chips that claimed to be the same thing, but had different code in them. Not only do they not know how to properly tune these trucks, they don't even use the same tune in each chip. It's a total crapshoot as to what you'll get.
ATR seems to be acceptable on a stockish truck, though I wouldn't expect it to really change much. Stock or Ultimate is really the way to go, unless you want a custom chip tuned to your truck.