Yes I assume AT&T would be fast cause it's emptier than VZW. I have noticed with friends that have VZW LTE that there speeds have decreased over period of time which is expected by both carriers.
I'm in a position where I can switch from AT&T to VZW and be able to get unlimited data from VZW. I'm currently grandfathered with unlimited data from AT&T.
Lisa you're the best reviewer out there, seriously.
On a personal note what's your confidence in AT&T in the LTE game?