The bottom half of the SEC is much better than the bottom half of the B10. That's the difference. It's way harder to beat Mississippi St in Starkville than Purdue in W Laffy. That said, our top half is every bit as good as the SEC. Playing Purdue hurts you in SoS, but playing Mississippi St helps. This is why they get the better computer ratings over B10 teams.
As both the B10 and the SEC continue to dominate college football, and get the majority of the CFP slots, there will be plenty of battles on the field between the 2 conferences. An in-season B10 vs SEC challenge weekend would be a fabulous idea. And yes, the SEC has to go to 9 conference games and get rid of their cupcake weekend. Correct those 2 issues and I'd be ecstatic!