Hi - I've also been admitted to both Northwestern MSiA and NYU MSDS, and these are the two programs I'm trying to decide between, so I am in the same boat as you are. I've also received generous financial support from Northwestern, which will likely factor into my decision (and still waiting to hear back on scholarships for NYU). I also currently live in the Chicago area, but would like to find job opportunities in NYC in the future.
Can I ask what your decision making process is, and where you are leaning towards?