number of macro faculty != quiality macro grad students.
I heard from a friend that the CBS flyout was horrible, which probably doesn't speak about Columbia's Econ program, but serves as a good indicator. Can you talk to anybody who attended?
I would personally choose NYU based on faculty for macro, good diversity of fields, low attrition and overall satisfied vibe I got from the grad students. Minnesota is also a great option, if you are sure you want to do macro theory it is the obvious choice IMO, otherwise NYU.