While certainly there is room for dispute, and techniques vary, I've found that Agfapan 100 developed in 1:25 or 1:50 Rodinol is maybe the most beautiful combination tonally that I have come across, especially for pictures of people. It edges the classic Plus-X/D 76 1:1 pairing in my book.(posted 9411 days ago)For what it is worth, I've done custom b+w printing for about 20 years and have tried every available medium speed b+w film, though certainly not all the developers. I personally find that visual grain is more the result of a)poor exposure, b)poor quality water in the make-up water for the developer that limits the action of the developer (summertime water here in DC is so acidic that you are basically trying to develop with stop bath), c)over aggressive agitation (the right amount is "just enough" and as smoothly as possible).
My experience is that most visual grain is very different from that which is inherent in the film.