+1 for trendland (#2) who summed it up just fine for me.
By "grit", do you mean a definite grain pattern, Odot? If so, Tmax 100 and D76 is the way.
I've shot a lot of Tmax 100 in my time, in my usual now-and-then way, 35mm in my Nikkormats, 120 with my Rollei TLRs. I long processed it in D76 1+1 in a Jobo, which produces the results I like. For a few years I played around with home-brewed Thornton's two-bath (The Ansel Adams brew for higher contrast) and thought it was OK, but last year I had a lengthy printing session to catch up on a few years of shooting, and I found the grain pattern and the contrast with the Thornton's were somewhat too soft for my liking. With D76 1+1, all was well and good.
I like to take my time when experimenting with new developers, but of late I've been reading older APUG and I like what I've read about using Xtol as a one-shot. So I'll do some tests in July and August, when I'm home again from my wanderings in Asia. Xtol may be better with Tmax 400 than D76. Dunno - I'll shoot and test a roll in the two brews and work it out for myself.
One of the few friends I have left in Australia who still processes film at home, does it with Rodinal (am unsure of his mix, but I believe he moves between 1+25 and 1+50 depending on the contrast of the scenes) and his prints have a LITTLE more obvious grain than mine, but nothing to worry about.
I first used D76 in the mid 1970s when I shifted from exclusively 120 to about an even mix of MF and 35mm. It has always been my go-to developer when I want nice, clean negatives with the best tones for normal light scenes. Shooting in Australia and also in Asia as I often do, the harsh daytime light can be a problem and here D76 also works well to tame the high contrast. I hope Xtol will do the same.
Looking forward to others' posts in this thread. Good info always available on APUG. Many thanks to you all!