In a sense, it makes sense. The AT&T models would be the fastest models in areas with no LTE service. However, in terms of LTE coverage, Verizon has a lot more of the U.S. covered than AT&T does, as Big Red has had its LTE service in effect for more than a year, and AT&T only started its rollout in the second half of 2012.
Despite that fact, AT&T branded "new iPads" are obviously outselling Verizon versions.
Just as with the 2011 iPad 2, we expect the "new iPads" to sell out soon, and eventually result in a longer wait time than then three days that are currently being seen vs. the first day of retail launch.
If you want a "new iPad" ASAP, you'd best pre-order it soon. Eventually, Apple will catch up with the demand, but there will be a time, probably longer than most buyers would like, where they will have to wait patiently for their new "new iPad."