OP, I’m very curious what criteria you used to decide that Southwestern has a “much better” department? To me, it seems much smaller and much more narrowly focused on a couple of research topics. It’s in the school of arts as opposed to school of sciences, without the ability to do a dual psych/neurology degree, which, depending on what you’re planning to do upon graduation (counseling vs. research/PhD/med school) could also be a negative.
And are you saying students like professors at Southwestern better because you looked at professor reviews for both schools on sites like RateMyProfessor? Because if that’s what you did, then surely you noticed that the Trinity professors have 20-40 student reviews on there, going back 15 years, while most of the Southwestern profs only have 5-9 reviews. With a smaller sample size, I’d be very cautious about drawing conclusions.
Not saying Southwestern isn’t a very good school - one of my daughter’s friends is going there, but she’s also a recruited athlete, which made her choice easier. For you, I think you owe it to yourself to visit Trinity, meet with the actual professors (we did a tour of the department, and came away impressed) and then make up your mind.
Think about it this way: imagine if, after graduation, you interview with a company and absolutely love them. They offer you a job and give you a few weeks to decide. Then, during that time, a more well-known/prestigious company calls you in for an interview. Would you not even go interview, because you loved your first company so much? Look at the new job’s website and say, “eh, they don’t look as good as the people I already met and liked”?