I obviously have too much time on my hands. I was thinking if the basement dwellers of each division were not included in the numbers, which would be the most winning division. The first number represents the win totals without the basement dwellers and the 2nd number indicates overall win by each division. (Den., Buf., Balt, Indy, Philly, S.F., Chi, and N.O. were not included)
1. AFC West 35-43
2. AFC North 30-35
2. NFC North 30-35
4. NFC West 29-30
5. AFC East 28-30
6. NFC South 27-30
7. NFC East 24-29
8. AFC South 21-24
I am not sure this means anything, but was interesting to look at. It does reflect a greater disparity between the AFC versus the NFC.