Gleason 8 is aggressive, so you might end up on ADT anyway just to be safe. Many people have few to no side effects from radiation, and there's usually no pain or recovery time (of course, you can get unlucky, as I did). And the overall survival rate between prostatectomy and radiation are the same.

If you do choose surgery, try very hard to get the nerve-sparing kind. Not every facility can do it, but it could make a big difference for ED and incontinence.

Best of luck, whatever you choose!