zyzyzyyy, congrats on your admits! Both Darden and CBS are phenomenal schools. However, with the current economic conditions, I'd choose CBS any day of the week. Your background in Fintech will also put you in a better position than your peers at CBS. Plus, New York has alot of activity in the Fintech space so again, although you might not wanna do that post-MBA, CBS will basically assure you a job there.
Additionally, looking at the Tech industry right now, my guess is - things ain't gonna be all hunky-dory by the end of this year (that's when you'll be looking for internships), so keep that in mind.
My final two cents are: choose a school that you would love to attend! If that's Darden, go there, if that's CBS, go there. You won't do another MBA, so just go where you feel you will have the best time.