@az765 Congrats on all your great options!
I haven't committed yet, but I am excited about Harvard's program and am strongly leaning towards committing. It seems like Harvard's core courses provide a strong foundation of applicable knowledge and skills, but they also dedicate half of the curriculum to electives which allows a good amount of personalization in terms of academic focus. The coursework is primarily project-/application-based, which really appeals to me, and it also seems like they understand and celebrate the interdisciplinary nature of data science.
I have more reasons that I'm excited about Harvard, but also don't know a ton about the NYU/MIT programs or your situation so certainly take my perspective with a grain of salt. I would also recommend looking at the information Harvard sent the admitted students if you haven't already. Good luck and maybe I'll see you next year!