Hi Madison,
You are wise to investigate surgeons before choosing one. I tried to use the web for information, but this site can be a good source, hopefully you will receive plenty of posts giving names of surgeons and results. Perhaps you will need to encourage members to send a private email so they feel more comfortable talking about their doctors.
I asked my surgeon the basic questions - how long have you been doing this and how many have you done. I didn't ask the question about results - that is an excellent question. I would think that surgeons that are working in high population density areas are doing more of these, than surgeons in rural or very suburban environments. Doctors are an honest bunch, it's extremely rare you would find one that would lie or deceive, and not in the area of brain surgery. Good luck with your search.