If you are a direct admit, as a transfer into the B school at UW, then I would keep it on the list and research the details about the B school and finance programs at each school more specifically. Look at class sizes in your programs, career services and placements etc. If you are not a direct admit into UW B school, then as a transfer, it would not make sense to have to get your pre-requisites in order and apply in spring of sophomore year.
I’m not specifically familiar with B school rankings outside the usual suspects, but a quick search showed that Forbes and Bloomberg have your schools clustered fairly close together in the 20-low 30 range for undergrad rankings and for graduate programs, UW is about 10 spots ahead of both BU and Rochester. You can argue with the rankings but that suggests those are perceived as roughly comparable schools. BU is not exactly a small school, with 17,000 undergrads and another roughly 15,000 grad students so I wouldn’t see size as a major differentiator, at least between BU and UW. What will matter more, in terms of a transfer’s experience, is the size of the program in your area of interest. Winter is going to be long and cold at all 3 schools.
Congrats on your admission as a transfer, and good luck with your decision.