I've heard a few "experts" lately talk about how the NFC is tougher. Not sure how they're figuring that.
The NFC currently has three teams at 9-3, seven teams at 7-5 or better and one team leading a division at 5-7. Three of the divisional third-place teams are under .500 including two teams with three wins.
The AFC currently has three teams with 3 losses, 11 teams at 7-5 or better and the worst division leader is 8-4. Three of the divisional third-place teams are 7-5.
The AFC leads the inter-conference games 28-25-1.