Always a tricky question in my mind and concern. FWIW my process boils down to making a list of the doctors who are not particularly long or short in their careers; further sort by school; lastly, I look at their bio to GUESS at who I like best.
My final sort is their position in their department; any published articles/research and how it sounds; and any society awards or accolades.
Remember, this is my home-brewed process. But it led me to an oncologist/urologist I really like both for his professional ability, personal approach, and great results so far (23-months post RALP and ADT for what escaped).
God Speed but don't rush too much and let's hope another survivor will add some good criteria for you (and me).