I know there's no such thing as a transitive property in comparing sports teams, but I actually think the "system" got it right in 2008.
I'd love for head-to-head to be the determining factor, but in a case like this, I just don't think it can be.
OU had a tougher schedule than us outside of getting Tech at home. For nonconference, they beat Cincy (made a BCS game) and TCU (was ranked at the time) while we had far fewer viewers against Arkansas, Rice, FAU, and UTEP.
But the biggest factor to me is the OU/Tech game. Tech crushed OK State (who we needed timely, close play to beat) the week after us and was riding high, and OU just effing dismantled them. To the point where they struggled against Baylor and got their asses kicked in the bowl game. If you had to put the Texas/Tech, Texas/OU, and OU/Tech games on a spectrum of determining the importance of teams in the Big XII at the end of November, then OU/Tech would be so far ahead of both of our games against either team.
To put it another way, I just don't think our win over OU was as impressive as Tech's win over us or OU's win over Tech.