Both teams have great players (though I still think I could get 1,000 yards running in a spread with guys like Walter Jones blocking for me...until the first good-sized safety tackles me and breaks something.)
But since both sides have great players, it comes down to coaching. Earlier I compared Cowher to Sgt. Slaughter. Who does Mike Holmgren look like?

Coccoon star Wilfred Brimley.

So now ask yourself: in a football game--not a chance to keep old people feeling young--who do you trust more to win it for you?
(Also, please ignore Holmgren's Superbowl rings...I'm picking the Steelers damnit.)