Both teams want to run.
Both teams want to stop the run.
Both teams need to protect their QB and give him time.
Both teams thrive on putting pressure on the QB.
Both teams have solid OL and DL's.
It all comes down to which teams big guys can take control of the game on both sides of the ball. Who's gonna open up the holes the best for their RB, who's going to keep their QB's jersey more clean. Our defense is built on putting pressure on the QB, that makes everything fall into place. SD is the same way. We mirror each other an awful lot.