If I was to guess, I suspect RT in the case of metastatic disease is most likely to win, because it covers the largest treatment area including the prostate bed, and can easily include and cure nearby lymph nodes, and is therefore likely to remove the largest tumour volume.
Prostatectomy has a sharp treatment cutoff, literally being the surgeon's scalpel cut. We already know in the case men not diagnosed as metastatic that this fails to cure in 30% of cases, mostly due to cancer already having escaped into the prostate bed. Also, Prostatectomy has the largest side effect profile impacting quality of life, being continence and if significant pelvic lymph node dissection is included, lymphodema (can mostly ignore ED as these men will be on HT anyway).
Including focal therapy seems a bit strange to me, given these can only treat part of the prostate in any case. I don't know how many metastatic patients only have small tumour burden inside the prostate, although focal therapies don't always aim to clear all the cancer in the prostate.