I think if it ever happens to me i'd rather the radiation than let them loose with a knife on me if there is such a choice as less chance of cancer cells going into bloodstream and cranking up somewhere else in the body after one has had their prostate cancer 'removed'. I don't even like biopsy's and will avoid them if possible too due to similar type risks as in knife work even though the level of risk is much lower with biopsy.
I hope yours is going ok and they did a top job as in killed it properly. They must be getting better at this job as time goes on i imagine.