Obviously not my career to make a hard choice between Texas and USC, but I would definitely take a little less money to work and learn from Lincoln Riley over Steve Sarkisian. Of course, there's probably more to it than just football. Choice has history in Texas from his Cowboys days and first coaching job at North Texas.
Still, turning down the opportunity to work with a HC coaching with the hottest offense in football, that's developed as many high level QBs as Riley has would be difficult to turn away from.
Regardless, Choice will be successful no matter what coach he works for, and wherever he ends up. He's just that kind of dude.