so sorry to hear about ur uncle. Hope everything goes great with his treatment and hope he doesn't need surgery! My friend was treated at sloan for tongue cancer, and she loves it there, and has met so many great survivors, one that was even stage 4 and terminal and now has an all clear!
Whatever one you go to they both sound like great places. Just go with which ever one feels best to you, after you do research and maybe ask docs from both places how many cases of this they have treated and what not.
I wish you and your uncle the best and will keep you both in my thoughts!