Is COA a consideration ?
If your dual credits will allow you to graduate a year early, then Southwestern should be given serious consideration.
P.S. Just read Fiske Guide To Colleges. Fiske ranks Southwestern academics a bit higher than academics at Trinity University. Psychology seems to be a top major at Southwestern. As for surrounding areas, Southwestern offers quaint small city of Georgetown with booming Austin, while Trinity has San Antonio.
One overlap school in common = Rhodes College (Memphis, Tenn).