I received my MSW from NYU in 2016 and am right now enrolled in the DSW program at Penn. I agree with the comment about similiar field placements. I know graduates from all 3 and all are well trained. I have heard Columbia can be more macro focused than NYU. I participated in a role play last week with PENN MSW students and were highly impressed. The structure of this role play by the faculty was impressive.....over 100 students broken in to groups of 4 and paired with an experienced LCSW/LSW.
You can't go wrong.