For I Banking in NYC both aren’t particularly well represented. Neither school is a target or has extensive alumni networks.
Consequently, I don’t think either school has an advantage over the other. To break into an IB analyst role the candidate will have to stand out independent of their academic institution.
FYI we do know lots of kids from our NY/NJ area suburb who have attended and enjoyed both schools. The majority have not returned for their careers much to the disappointment of their parents.