I have used Pyrocat-HD almost exclusively for semistand and EMA development.
This summer, I spent a bunch of time exploring Double-X and - after hundreds of exposures - I have determined that at least 35mm Double X really doesn't like highly dilute developers like Pyrocat (conventional or standing development) or PMK. I find the grain to be objectionable no matter what I do. Interestingly, Double-X seems to do really well with D-76 1:1.
With 120 it's less of an issue but I am likely to seek other options for this film.
TMY interests me because I'd love a faster, low grain film at my disposal. Does the TMY take Pyrocat stain well? I could never get TMX on board with stain for some reason.
I always liked my PMK negatives, but disliked the longer print exposure time. I'm happy with the results from both TMX & TMY....i look more for the tonality than the stain, and I've gotten near LF results from MF & one added benefit ......the combination of TMX with older lenses ....you get acceptable sharpness...with the old lens character. Both the images i post were taken with my Voigtlander Perkeo ll w a Color Skopar (1953)