Here's my nonprofessional, nonguaranteed reaction to your pros and cons.
The pros for Mills tend to be specific advantages that you personally actually like. You seem to like Mills as it is, more or less.
The pros for Davis seem to be general opportunities, characteristics that people of many different tastes could take advantage of. (except the horse: how important is your horse in your college planning?). It sounds like Davis is not so much likeable for you as it is a place you can take advantage of.
With the cons, it seems to tend to the opposite: the cons for Davis tend to sound like things that you really dislike, while the cons for Mills sound more general, things that might not be ideal but that you don't necessarily seem to actively and personally dislike.
Make of that what you will--I hope it helps!
Good luck with your decision!
