The Holiday Bowl will not choose Nebraska over Oklahoma. The Alamo Bowl does have a higher payout, but better bowl? Don't think so.
It doesn't have the same pros - Iowa sucks, which means you will probably win easily and I guess I can understand the desire to win since you are rebuilding.
TCU is from a lesser conference, but they have been one of the winningest programs in college football the last 8 years. How can you think that playing Iowa would be a better for your program? Unranked, underachieving - a win does nothing.
Reliant stadium is considered the best stadium in the NFL, the Alamodome is a piece of crap. San Antonio is nice, but Houston is more Nebraska's pace.
Tuesday night vs Saturday night? No question, more people will travel attend the latter
Dec. 27 vs Dec 31 - I bet San Antonio nightlife will not be jumping on the Tuesday after Christmas
I guess a lot of this doesn't apply if you aren't going to the game, but I know a lot of Husker fans will want to travel.
Regardless, best of luck to your program - the Big 12 North sure could use a power house program again!