All of these schools are quite different. UVM is a state college with 13,000 undergrads and a variety of different majors. BC is a Jesuit university with a lot of its social life rooted in athletics. Yale is an academically-focused Ivy League and is arguably considered the best college in the country. Brown is also an Ivy League, but it's academics are much more liberal arts-focused ("concentrations" rather than "majors"). However, all of these colleges are incredibly strong academically - seems like you're in a good position! Good luck!