No ACGME spine surgery fellowships, so do you only send to neurosurgery?
Acgme is standardized (though a 20 epidural quota is kind of silly) to an extent which is why it is deemed better. Other fellowships are all over the place and sometimes call themselves fellowships just to have indentured servants.
We have this argument on here frequently. If you want a well rounded pain experience, go for the acgme. Get your month of psych, anesthesia, pmr, Neuro, etc. if you want to work with primarily ortho or mak stuff, go the nass route. Nass is mostly pmr guys anyway, since many many acgme institutions prefer anesthesia grads, less spots for pmr. So the pmr guys just took their ball and play on a different court in the same playground.