Big Ten.
The Big Ten won only five games against teams from other BCS conferences. Making that stat worse is that Ohio State's win at 4-9 Washington is the Big Ten's best non-conference win. League teams beat Syracuse (twice), Pittsburgh and Washington State. And Michigan's loss to Appalachian State was one of two losses to I-AA schools (Minnesota lost to North Dakota State). Among other embarrassments: Northwestern ended Duke's 22-game losing streak, and Iowa lost to Iowa State and Western Michigan. At least the Big Ten went 16-3 against the MAC and 4-0 against Notre Dame.
If you want to win, bet against the Big 10 come bowl time.
The Big Ten won only five games against teams from other BCS conferences. Making that stat worse is that Ohio State's win at 4-9 Washington is the Big Ten's best non-conference win. League teams beat Syracuse (twice), Pittsburgh and Washington State. And Michigan's loss to Appalachian State was one of two losses to I-AA schools (Minnesota lost to North Dakota State). Among other embarrassments: Northwestern ended Duke's 22-game losing streak, and Iowa lost to Iowa State and Western Michigan. At least the Big Ten went 16-3 against the MAC and 4-0 against Notre Dame.
If you want to win, bet against the Big 10 come bowl time.