Both are fine Hospitals, University of Penn, and MSKCC. In NYC there are also a number of other top Head and Neck Cancer Centers like Mt. Sinai, Beth Israel, NYU, Lenox Hill Hospital, NY Presbyterian to name a few, plus a Proton Center in Somerset, NJ that some are affiliated with. I know a few of these have transoral laser microsurgery, and robotic surgery. There is American Cancer Society's Hope Lodge, on 32nd Street, which is free for cancer patients, and a caretaker, during cancer treatment, follow-ups, testing, and stayed there myself for 6 weeks, instead of a hotel for $350 a night, minimum, and rate them even better than most hotels.
Btw, I had 7 recurrences having radiation 5 times to the same area, with three different types of radiation modalities, IMRT twice, HD-IORT twice, and just completed Proton Therapy, including 5 neck dissections, flap, carotid removal, on the same side too, and three different cancer treatments, either at Mt. Sinai, Beth Israel, a local radiation center, oncologist, and ProCure Proton Therapy Center in NJ, where I've seen patients in their 80's, and I have no major complaints myself. Actually, my oncologist's office wasn't too young either, and I was probably the youngest during my scheduled time, so it possible anything can be done.
I hope this helps, and wish the best.