My D is a recent BMC grad so I’m coming at this from my perspective as a parent. I think you’ve received lots of good feedback to help in making your decision. You’ve got two excellent choices. I’d just add one thing–I perceive the BMC/Haverford/Swarthmore consortium (Tri-Co) as a great opportunity to have many choices, perhaps more than you’d get at most LACs of the same level. There’s a great deal of flexibility in how you can use the consortium–I don’t know if you’d have this much flexibility at Smith.
For example, a friend of my D’s felt that there was more opportunity at Swarthmore to focus on a particular subfield within her major. That friend (who was a student at Haverford) was able to take many of her major courses at Swarthmore. My D took courses at Haverford every semester and a few at Swarthmore as well. D’s roommate took two courses in urban planning at Penn to supplement her Cities major at BMC. Finally, you can take courses at Penn, if the course you want isn’t available through the Tri-Co. I don’t think these experiences were unique to my D and her friends, although I grant you it’s anecdotal data.
I’d agree that going with your intuition isn’t a bad way to make a decision. Good luck with your decision.