3 and half years ago when I was looking at treatment options, I compared proton and photon and chose Proton because of the tissue damage issue. Since then there are advances in photon radiation with image guided and volumetric radiation that reduce tissue damage with photons. A friend of mine consulted with my radiation oncologist who did my proton therapy and my doctor recommended to him the advanced form of photon. It may not be so clear cut which is better. As with all medical treatment, get as educated as possible and then discuss options with your doctor. However, I would be sure that you have access to most advanced form of photon therapy.