Look, setting aside everything but "Which would make the better, more interesting GAME?", I'd have to answer "OSU"...
BUT, using the "Eyeballs-Test", I must tell you that I am as CERTAIN that 'Bama beats OSU as I am that LSU does; factor in the relative damage of their respective losses against the respective teams they lost TO (Iowa St. was a TERRIBLE loss--a choke-job against a FAR inferior team), plus my admitted SEC-bias (which has the added virtue of being valid: The SEC truly IS the best Conference in the game by FAR), and I arrive at the easy conclusion: "Tide vs. Tigers in the BCS Championship Game this time around."