They are about to reveal the #4 team. I don't like either, but I would vote for Bama. One loss against Auburn on the road. If they played them at home, they would probably be 13-0.
OSU has some better wins, but I have no doubt Bama would beat Wisconsin and PSU. They also lost to Iowa by 31 (which I know no Saban-coached team would ever do).
That said, I have a hunch they will select OSU. I would favor Clemson against either team in the playoffs. Clemson probably beats OSU by 2 TDs.