Counting also their pro career? Jim Kelly, no question.
Kelly had great leadership, great arm, good accuracy. A classic pocket passer who could really sling it.
Counting just their college career? One could argue Bernie, because he got us there first. One could argue Dorsey, because of his place on the 2000, 2001, and 2002 team, losing only his first and last game.
I personally like Steve Walsh, winner, cerebral. Wasn't an athletic, but was the ultimate game manager.