Back when I was big into b/w film I tried a bunch -- DD-X, Rodinal, Diafine, HC-110 (maybe XTOL too) but always came back to D-76. I got the most consistent results with it, negs always looked good, and it's easy to use. It was also available locally "then" and could walk to a nearby camera store and buy a pack if needed. The rest had to be ordered online. Very forgiving, almost impossible to screw up. Downside was it might oxidize but I bought these collapsable bottles that kept air out. Seemed to work. Rodinal has a virtually indefinite shelf life and was a little sharper (but really, not all "that") and lasts forever but not versatile and definitely more visible grain. Also it had to be diluted so much I never felt confident I got the ratio right (but always did). Diafine caused bromide streaks in some rolls. You can keep it. DD-X was good too but a bit pricey iirc. I didn't see what all the hubbub was about with HC110. It was "okay" but never got on with "the goo" and didn't see it as any better than D-76, so why bother?
So good ole D-76 it was for me.
So here's my "controversial" statement that will upset some. "I" think D-76 is seen as a "for kids" or "starter" developer. Something you use in HS photography class. Grown-ups use (fill in the blank) developer. Kinda like "real" photograhers shoot RAW. Baloney. (And I think that's why although the poll has D-76 in a virtual tie for first? Few people jumping on this thread talking up D-76. C'mon D-76 users. Come out of the closet. It's okay! We both know that this is the best developer out there... No need to be shy.)
Meanwhile, D-76 is perfect. Plentiful, inexpensive, easy, versatile, forgiving, consistent. You can push with it, pull with it mess with the dilution. Forget you have negs in the Jobo, pull them out a week later, they look fine.
Yeah. I'm on team D-76.
But I no longer fool with black and white film. But if I did?
THE MIGHTY
D. SEVENTY. SIX!
The rest you can keep.