(Layperson writing)

Overall survival is the same for radiation and radical prostatectomy, according to my onco team, so (in my personal opinion) it's mainly a question of trading off different possible side-effects and assessing your ability to tolerate surgery under general anaesthesia.

For people with advanced prostate cancer, radiation is almost always preferred to surgery, because the cancer has escaped anyway so why do any unnecessary cutting (plus, I think, radiation spreads a bit and can kill cancer just outside the prostate as well).

Good luck!