Paulit, my sympathies, the initial diagnosis feels like you are in a process where everyone else (at least, the medical professionals) seems to know what is going on but you are still trying to work it out. Could be the basis for a Kafka novel!
The way I see it, PSA 4.8 is at the low end but Gleason 9 is high. If the professionals tell you the different treatments are likely to work similarly in your case they will have looked up the probabilities based on your situation - but don't take it on trust that you are average, Check all the excellent information provided by Prostate Cancer UK (downloadable from this website).
It makes sense that you have been put quickly on hormone therapy, and that is likely to slow down the tumour growth so that you don't have to worry about a few weeks to the next step. But I do know from current personal experience that you still want to feel things are heading towards a solution!
If you really worry about spread to the lymph nodes, that won't be solved by prostatectomy alone and you may still end up worrying whether the "right" lymph nodes have been removed. In that case radiotherapy might be the better bet. What I am saying is the best decision might be about the psychology rather than the cancer.
(To give context, I am currently in a similar "process" of dealing with a PSA recurrence following previous prostate surgery. The knowledge that being put on hormone therapy has already reduced my PSA massively means I am a lot less stressed about the time it is taking to get salvage radiotherapy).