I think overall it's because historically the NFC teams are the more high powered offenses who run and gun more, such as the Cowboy's and 49ers in the 90's. Most teams in the NFC are flashier teams who usually put up big points and play less defense. The AFC overall in history have been teams that run the ball more and play better defense. Such as the Steelers, Ravens, but there are always exceptions. Like the Colts and Pats who are more of an NFC style team who just air it out and there are NFC teams that run more. It's just perception year to year of who the people vote for and believe the best teams are. Overall this year, I think the NFC is the better overall conference as far as depth goes with good teams. There is the Saints, Vikings, Cardinals, Eagles, Cowboys, Packers, and Giants who could all make splashes in the playoffs depending on who gets in. The AFC is tough to though and compare well with teams in the NFC with the Colts, Bengals, Chargers, Patriots, Steelers, Broncos, Ravens, Dolphins, Jags etc. Now that I look at it, I do think this year as far as depth of good teams the AFC has an edge.