I can give you a little insight from a Trinity student perspective:
Trinity University is a wonderful school, and I’m very glad I chose it. Small class sizes and very friendly and approachable teachers. One who I had last semester for American Politics, Dr. Burke, was incredibly insightful and allowed healthy discussion in the room. At the beginning of the semester we (anonymously) took a political spectrum of the classroom, just to see what viewpoints we were working with, and we had the entire range from liberal democrat to conservative republican. I admired Dr. Burke’s ability to question everyone’s opinions and beliefs in a constructive and fair manner while keeping order in the divided classroom. Granted this wasn’t a class that emphasized political discussion, I just brought up this example to show the sorts of professors you might encounter. This is the average interaction, at least. Many professors are just as good, if not better than the wonderful Dr. Burke.
Because it is a liberal arts school this is to be expected, but I thought I’d also outline the fact that you must take classes in many different disciplines. A state school won’t always make you do this beyond general baseline courses. I’m a chemistry major, yet I’ve also taken that American Politics class with Dr. Burke, and a class on science fiction (in addition to many others) as well as my major required classes.
Politically: the new mayor of San Antonio recently won a surprising victory over the incumbent, and he is a Trinity graduate, and in fact, the district seat that he left vacant was won by another Trinity graduate. In addition to these local government seats, Senator John Cornyn and other major politicians are also Trinity grads.
Finally, a few more things to consider: San Antonio is one of the nation’s fastest growing cities and already one of the largest and known for it’s vibrant culture! There are always things to do on and off campus, whether it’s joining the swing dance club, heading to the river walk to look at Christmas lights, visiting the old Pearl brewery, or going to a concert at the Tobin center, you wouldn’t be bored there.
Ultimately, the decision is yours. I don’t know anything about MSU so I won’t attempt to pro-con the two schools .
Best of luck in your decision making!