My own experience is that HC-110B has a tighter more even grain pattern than D-76. It can be readily observed with a grain magnifier and also in prints of sufficient magnification. D-76 1:1 on the other hand produces more acutance and edge effects. I have little experience with X-Tol and T-Max Developer. I have found that T-Grain films work nicely with Rodinal at 1:31, BTW. The differences take time to appreciate and everyone has different opinions which ones are best. Back in the 70s, when photographers started talking about their work, one of the first questions was, what film and developer combination do you use? Now it's Canon or Nikon, Photoshop or Lightroom.