Hi Big Joe. Gamma knife and cyberknife do have some differences. Gamma knife is generally one treatment. Cyber is usually several treatments at somewhat lower dose. Gamma been around longer. The principle is the same - does not kill the tumor per se, it stops it from reproducing. As old cells die they are not replaced. Can take up to 2 years to know if it worked. Can sometimes (not always) swell when the radiation is working, causing discomfort.
Many times people do lose their hearing with radiosurgery also, same as with regular surgery. Middle fossa is the surgical approach most likely to save hearing, but is not always successful.
You might also consider another opinion on whether its really time to move on it. Not all doctors are the same. It's your decision.
And if you really want to know about surgery, don't ask a radiosurgeon, ask a surgeon. They do tend to advise most positively on what they know the best. Make sure whoever you talk to has lots of experience. Ask them how many they've done - should be at least several hundred.
Feel free to PM me if you want to talk or anything. Keep us posted. Thanks!