I will provide an essentially unbiased list based on my experiences from meetings, hearsay, and surgical volume.
Complex Spine: BNI, Northwestern, UVA
Endovascular: Buffalo, Jefferson
Tumor: UCSF, Mayo, MGH, Hopkins (the big 4 in the SPORE grant)
Radiosurgery: Pittsburgh, Mayo, UVA, (possibly Florida)
Skull-base: BNI, Arkansas, Mayo, USF, Cincinnati, Miami (These are probably the only places that have the players and the volume to make it a strong skull-base program. However, other places are decent and will give you what you “need” as far as residency training goes).
Pediatrics: Boston Childrens, Utah, Pittsburgh, WashU, CHOP, USC-CHLA, Riley’s-Indiana