I would go to Courant if these were my two choices. One could make a solid argument that Courant has the best faculty + curriculum combo out of every program listed here on QuantNet. I have them pretty equal with Columbia MFE, CMU, and Baruch in my personal opinion (what you want out of a career and small preferences will ultimately decide which of these 4 you pick). As I said, if it were me, I would pick Courant and look forward to the data science/machine learning courses from Kolm, Ritter, and Dimov. I'm happy with the decision I made, but I would've been just as content if I decided on NYU as well.
This is not exhaustive, but just some of my thoughts as a future student as well.
Congrats and good luck!