What is your likely major? Alternately, what majors are you considering?
What state do you live in? Have you considered the travel time? As one example of a possible minor issue, we have had a daughter’s travel from university to home or from home to university delayed by a day in a few cases due to snow. Of course this could happen in either Michigan or Boston.
Boston College and the University of Michigan are both very good universities. You can get a strong education at either of them.
Do you have a preference?
I have only been to the University of Michigan once, on a very cold week in the winter. I sort of liked it anyway but I did not get to see much of the area around the university. I have been in Boston quite a bit (I got my bachelor’s degree in the area) so I am a bit more familiar with it. There are of course a very large number of universities and therefore a very large number of university students in Boston and the surrounding towns.
Congratulations on your acceptance to multiple very good universities.