Great question! We are in a very similar situation and your school descriptions seem like similar schools, too. My D is down to only 2 schools for ED/ED2 after 3 visits to each plus trips planned to some athletic games to get a feel for school spirit. GC says she has equally good chances at both based on past students.
The only other criteria I can suggest looking at is what her classmates are looking at. One of D’s schools has a lot more interest than the other among her peers, something like 5-6 others applying to a school that generally takes 1 student per year from our school. Our strategy is focusing on who is using the more popular school as ED1, ED2, or RD to see who her direct competition is more likely to be and making the assumption that the other school will have less applicants from our school (still takes 1 out of the 1-2 applicants every year).