I think that Decipher will be useful for making a decision, so wait for that. Also - if you see IDC or cribriform in your pathology report, you might have somewhat better results with RP first and keeping radiation as a reserve if you have BCR. Sometimes cribriform and IDC can show resilience and survive radiation if it was not long or strong enough. Unfortunately biopsy can miss those features because biopsy examines only about 1% of total volume of a gland. My husband was 4+3 on biopsy but was upgraded to 4+5 after RP and detailed examination of the gland.

If you do not have high Decipher, cribriform or IDC, radiation and RP would give you same results with a caveat of not having RT as possibility later since you can irradiate the same area only once. Also, RP does not require ADT which was for my husband important factor. It comes really to personal preference IF you do not have highly aggressive cancer.

Wishing you the best of luck with whatever you decide.