There are a ton of factors that go into this decision. What is interesting to me about this argument is that although these schools have similar entrance scores and are relatively close to one another, I seriously doubt if two schools in texas are more different. Houston is much more traditional in that they have full days of lecture while galveston has half days plus pbl. Houston has a vast array of clinical opportunities that might exceed that of UTMB but galveston typically has higher step I scores. Galveston has a giant preceptorship program with almost every speciality represented. Look at the school's websites, take in the information from the interview day, and it should become very clear to you which is a better fit for you. Plus, UTMB offers the clinical years in Austin to a number of its 3rd and 4th years, so if the small size of Galveston scares you, you could be in a big city halfway through which might influence a decision. Most of all though, they are two great schools that have amazing and unique qualities and I wish you the best of luck with your choice down the road.