My current swallowing is slightly compromised due to surgical extraction of all my teeth, but was fine before that, minus the usual trouble during several treatments, side effects. I do have a peg, but not totally tube dependent, which was put in after having only chemo, which effects were worst for me than radiation was later on, so I kept it through the years being compromised already, and the potential need during re-treatment, and my theory was correct.
The best I would say are those that treated me lol, in NYC, where there are more top hospitals, and doctors than any other place in the country, but those listed by the NCCN, NCI, and U.S. News Reports best hospitals are top also, and many are here, elsewhere, if travel or insurance is not a restriction.