Similarly, at 65y I had a localized, Gleason 7(4+3), and PSA of 7.9. I had been on active surveillance for 9 years, and had much time to get referrals and evaluate all treatment options. Ultimately, I chose 28 sessions of proton radiation (at 2.5 grays per session; had treatments during April-May 2021), 6 months (two 3-month injections) of Eligard, and SpaceOAR Vue.
I did not go with the shorter 5-sessions of proton due to the reported higher risk of urinary bother with the higher radiation dose each session.
Just like someone would do when choosing a surgeon for a prostatectomy (with lots of robotic experience), ask questions and choose a radiation oncology team that has significant experience with proton radiation hitting small targets.
If you have the chance, look up the Bragg-Peak as it relates to proton radiation treatment of the prostate.