Why this combination. D-76 is high in sod sulfite and the
results won't be as sharp as a higher acutence developer. Ummm,
because it's a classic combination, and for good reason! I use
Tri-X processed in ID-11 or D-76 1:1 almost exclusively these
days. The sharpness is very good, but not harshly so (yes, for
the kind of work I do, there is such a thing as too sharp). The
grain is definitely present, but is soft and beautiful. It
yields a wonderful glow when properly printed.  Of course, the
'best' film/developer/paper combo is entirely dependant on how
and what you shoot, and your personal preferences.