Favorite 50mm ~ Jupiter 8, no doubt. I have a '56 & '63 model. I seem to use the '56 more. It's sharp enough for me (though that's not always a must for me to like a shot) and produces some nice colors.
Next 50mm is the Industar 22, my "pocket lens" when I don't want to carry a bag and just drop one of the Zorki 1s in my pocket and go. I too kinda like the "urban grittyness," as Solinar aptly describes, that it often produces.
I have an Industar 26M, but because of my above preferences, I just don't ever reach for it, so I really have little experience with that one.