I would have to say the Steeler in the 70's were the best team ever, with Bradshaw, Swan, and th rest on offense, and Mean Joe Green, Lambert. and the rest of the Steel Curton defence. if they wern't the top team all time they have to be in the top 3.
have to add, just on record alone, pats 07, dolphins 72. if pats win superbowl they get the edge. with parity in the league and free agency, their football brain trust is second to none right now.