Looking at this whole SEC vs Big 12 argument, I think it's possible the Big 12 could be stronger, but we won't know until they face tougher competition. Just looking at the strength of schedule, the Big 12 is falling behind the SEC right now.
Oklahoma - 78
Missouri - 142
Texas - 115
Texas Tech - 129
Kansas - 101
Oklahoma State - 120
Alabama - 39
LSU - 114
Georgia - 29
Florida - 46
Auburn - 68
Vandy - 35
Of the top 6 teams in each conference, only LSU has had a weaker schedule than anyone in the Big 12 (and they still have had a tougher schedule than Missouri, Texas, Texas Tech, and Okie State).