As far as winning the BCS, Vegas thinks the Bucks are better odds. They consider OSU at least 4 times as likely to win the BCS title than any of the other teams.
Head to head would be another story...but the discussion at hand revolves around OSU making and/or winning the BCS title.
Sportsbook.com
OSU +550
UGA +2500
LSU +3000
JohnnyFootball +7500