The 2002 season saw the Houston Texans replace the departed Oilers as the league's 32nd franchise.
Thirty-two was a nice round number, so the NFL decided to reorganize the divisions into no less than eight distinct groupings of four teams based on geography (unless the Cowboys are involved). One team, the Seahawks, even switched conferences.
The NFL has a very simple and fair scheduling process, but like every other North American league, we can not completely take the numbers on face value due to the different strength of schedule teams will always have in non round-robin processes.
That said, let's look at the cold hard numbers. Every group and team ranked by regular season wins, out of a possible 144.
C = Conference
D = Division