I vote for UTHSCSA.
Obviously each school has its own identity that will cater more to particular applicants. My perception is that in terms of prestige: UTHSCSA > UTMB > A&M. The SDN consensus, it seems, is that UTHSCSA has the "happiest" students in TX; they have a lot of camaraderie. As for location, San Antonio is arguably more fun than Galveston or College Station. UTHSCSA's new curriculum appears to emulate UTMB's, which is a good thing. Also, UTHSCSA has just finished and is completing several new building projects/upgrades, or so I've heard. Proximity to family is another concern.