It is a great question you pose, ANSkeeterMcGee!
When you talk to a a specialist who does neurosurgery, they like to quote studies that tell how those who had radiation for their VS (or AN) lose their hearing over 8-10 years.
When you talk to a specialist who does radiation, they like to quote studies that say there isn't much difference between hearing loss in surgery patients and hearing loss in radiation patients. They also like to say that many AN patients are elderly when they have their radiation treatment, and there is naturally a decline in hearing (even in non-AN patients) over the 8-10 year period.
I am not a physician, and I cannot give you medical advice. But my perception is that what matters most is not whether you have radiation or whether you have surgery. What matters most, in my opinion, is the quality and experience of those performing the treatment (no matter what the treatment is). There are patients on these forums who have gone to a local neurosurgeon who only did one or two VS surgeries a year, and the patient ended up with horrible facial paralysis. Likewise, there have been patients on these forums who have had GammaKnife or CK by specialists who did not have much experience. These patients suffered terrible hearing loss and other issues.
Again, in my humble opinion, I think it matters more on the experience of your specialist than it does on which procedure is better. There are many in these forums who have chosen to have surgery and have done well. There are many on these forums who have chosen to have radiation and have done well. Remember that you are placing your brain in the hands of the specialist you select, so please choose wisely.
Best wishes!
Don