The SEC went 11-7 vs. BCS AQ conferences. If we throw in Florida's loss to Georgia Southern and Kentucky's loss to Western Kentucky, that makes it 11-9. That's not a great record, but, by my count the Big-10 went 9-8 against BCS Conferences/Notre Dame, plus Iowa's loss to Northern Illinois, Indiana's loss to Navy, and Purdue's loss to Northern Illinois, which makes it 9-11. Foolishly, the AAC still counts as AQ, and I am not going to go back and count out those wins.
To put it another, total non-con win vs. Automatic Qualifiers (including Notre Dame) gives the SEC the lead vs the Big 10, by my count, at 11 to 9. Total conference losses also benefit the SEC at 7 losses versus 11 for the Big 10.
Maybe the SEC plays an easier non-con schedule, but the SEC still has more wins against roughly equal caliber team (AQs) and fewer losses against non-conference teams.