Hi Tina
Since it's introduction in 1968 to treat cancer, GK has enjoyed a good record of success. CK has about 20 years of results to draw stats from and FSR, abou 13 years.
Everyone has an opinion and others may disagree and that is ok, but I will express a personal preference for GK if surgery isn't utilized. Surgery, however, is my personal first choice.
GK is very accurate, but so are the others. Because of it's protocol and 'initial' hit of gys ( rads ), it 'may' have a more significant impact on disrupting DNA which perpetuates tumor growth.
I'm concerned with FSR in this regard and particularily a 21 day regimen.
One might argue that fractionalization is safer for the facial, vestibular, and auditory nerves but GKs gamma rays ( from 201 angles ) do go in weakly, are pretty potent where they intersect at the AN and exit at 1/2 the strength they had when entering. Thus, there is minimal collateral absorption into surrounding tissue by GK as well as the others, as FSR.
My gut feeling is FSR, et al, were developed largely in part to capture a market share as being new and innovative. Also, some researchers are always looking for high tech ways to approach situations. It's human nature to try improving things.
I hope your Thanksgiving is/was well!
Best wishes for the best Tx modality choice for you, Tina! After much research and a few opinions, I think you will develop a 'gut' feeling as to what you want to do; Then, put your faith and trust in that choice and the service providers which need be well experienced!!
Russ