Bradford is a significantly better prospect than Clausen. But, with that said, I don't think either one has the upside of Jake Locker and Ryan Mallett, both who will eligible next season.
colonels and kidd:
Bradford actually didn't run shotgun all the time. Yes, he did quite a bit, but he also played quite a bit under center. He's not the typical spread or system QB like Jason White was. The Oklahoma offense was modified to suit Bradford's skills, and that involved more snaps under center than White or Heupel did.
While Clausen did perform out of a pro-style offense, I have significant questions about his leadership skills. While I think he's a better NFL prospect than his predecessor at Notre Dame, who I absolutely thought was overhyped, there is still something missing from Clausen which doesn't make me believe that he's going to be a star that his skills suggest he should be.