I'd add a distinction here: In my years since becoming a fan (early 2000s), NU was the better team (most years) and OU was always the better team. It wasn't Norman or Lincoln so much as it was we were playing teams better than us.Did we ever win in Boulder? Always seemed a nemesis locale for us, along with Lincoln and Norman back in the day.
CU was different. We were much more competitive with them and beat them semi-frequently. So it sucked a lot more when we would go into CU expecting to win (like the week they lose their coach) and get it handed to us.