After reflecting for a while on this question, it struck me that it really isn’t an equal or fair comparison. While both Texas and Oklahoma State are clearly longtime athletic rivals of the Sooners, it’s probably best for this purpose to frame this question in a football context.
Oklahoma and Texas have experienced tremendous success in college football and have a rich, deep-rooted history and tradition in the sport. The two schools have 11 national championships and nearly 80 conference championships between them. Their rivalry in football spans over 100 years and 111 games, even though the Longhorns and Sooners have only been members of the same conference (Big 12) since 1996.