You are right that the studies show same results for both types. My concern was the possibility of future issues from photon. I understand the newer photon machines that can skirt organs to the prostrate. The disadvantage of the proton is the equipment and facilities needed to produce the protons. We had a place near the Phoenix site, but a number of guys had to travel and find lodging. They also have 5 treatments for a number of patients. They were just testing it when I was tested. I had 20 sessions which was the fewest then. The amount of the radiation is the same regardless of the number of treatments.
For the first 3 years I had follow up every 6 months and yearly since then. My PSA was negligible each year. Glad you are able to exercise. It makes it better for you. My Gleason was an 8 and high risk, and now have been cancer free and feel good and active at 78.