I had the same predicament a year ago, although GW and Vandy were also an issue. The best way to resolve the issue is to do two things
1) Figure out where you want to practice:
2) visit the schools
If you want to work in NYC only, then Fordham is the best option.
If you may want to work elsewhere, then BC is the best option.
If you got a scholarship from BU, then BU may be a good choice.
If you want to study in the heart of the city, then fordham and BU are good choices.
If you want to have a quiet place to study just otuside of the city, but still have a big city 15 minutes away, then BC is the best place.
If you want a library, then BC and FOrdham are the better options, as BU doesnt really ahve a law library. If you dont mind studying at home, BU works.
if you want undergrads running around, BU is a good choice,
If you want to be apart from undergrads, BC and Fordham are better choices.