It’s an ‘educated’ roll. Outcomes are the same, however side effects are different.
I had surgery done by a very reputable surgeon - a pioneer in robotics. I became completely impotent, but not incontinent for which I am grateful.
I then had salvage radiation which, so far, has given me no side effects (the surgery took care of most of them!). The main advantage of surgery is that it gives you the chance to do radiation if your cancer returns. Not so much if you do radiation first.
But if you are a solid G 3+4 with a low Decipher score and no presence of cribriform cells in your pathology, IMO radiation (either SBRT or IMRT) is an excellent treatment with less side effects than surgery. Just my opinion based on personal experience and that of friends who also had PCa.
Phil