It be the homer in me, but I have to go with Pace. He was the most dominating player, regardless of position, that I ever saw play the game.
I officiated one of his HS games and saw how devastating he was there. He was also a very friendly and humble young man at the time as he was a captain for Sandusky HS and would represent his team when we had to discuss penalty enforcement's. He would smile and it was always "Yes sir, No sir, we'll take the penalty Sir." That may seem petty, but it was a refreshing change from most kids his age.
As a college player, he did not give up a sack his last two years at Ohio State. He won about every award that a lineman could win and finished 4th in the Hypeman award in 1996. I remember after playing Notre Dame, Lou Holtz stated that Pace was the best lineman playing football, not just college. Pretty high praise from an opposing coach.