I see what you are saying, but by that logic, why does Texas Tech not get to go?
This is one of those things that could go around in a circle for days. It's completely subjective.
I think you throw Texas Tech out of the argument because they got destroyed by Oklahoma. Granted, they beat Texas but it was on a last second touchdown. Texas-Texas Tech was an extremely tight game played in Lubbock. Now for Texas to go down there and play a tight game and nearly pull it out, that carries weigh.
Oklahoma smoked Texas Tech on their HOME field. Albeit, extremely impressive. If Texas Tech had lost a tight in Norman, this arguement becomes much more interesting, however, they got destroyed. Just for that, I push them below both the Sooners and Longhorns.
Here's the kicker for me. The head to head matchup in Dallas. This game was played on a neutral site so there was no home field advantage. Texas wins by 10. That carries the most merit for me.
Now, you have Texas beating Oklahoma at a neutral site BUT lost a tight road game in Lubbock.
Or you have Oklahoma who smoked Texas Tech at home(who narrowly beat Texas at home) BUT lost to Texas on a neutral field.
Or you have Texas Tech who narrowly beat Texas at home BUT went on the road and got embarassed by Oklahoma.
I have to go with Texas on this one. Out of the BUTs, i think theirs is the least of a negative.