EDIT: As of right now I've pretty much abandoned PCB and RCB developers for everyday work. There's nothing wrong with them, they work fine and I have no issues, but I found that I can achieve the same results of both PCB and RCB with PCM. Just trying to simplify things for myself.
What are your "go to" developers?
My go-to developers are an old bottle of Agfa Rodinal that seems to last forever and just a quick mix of Kafenol 327 which is nothing more than Reinhold's CC-M, I use a teaspoon measure and measures out 3 - 2 and 7 measures in quick succession, for one tank of 35mm film. The developer seems to tackle most films, and I use it for all types of films (even KOdachrome) if necessary.
In earlier times D76, and Accufine was my go-to developers, these days I have to travel to find that....