Texas is a horrible, inexcusable loss.
As far as wins go, if ND beats Stanford their best wins are:
Stanford
Navy
USC
Temple
If OU beats Ok St, their best wins are:
Baylor
Ok St
TCU
Probably Tennessee
Baylor is probably a better win than Stanford. Navy is about the same as Ok St with the edge to Ok St. TCU is a better win than USC. Temple is a better win than Tennessee.
I'd say the win resume is very close. The loss comparison tips it to ND IMO.