I assume you mean HC-110, not HC-100 (is that a low cost variant
?).
In which case, all three of your listed choices will give excellent results. You may find the convenience and flexibility and long life of HC-110 advantageous. Alternatively, you may prefer X-Tol's low environmental impact and ease of use in a replenishment regime. Finally, you may like the fact that there is so much information available on D-76.
Fixers, when used properly, should have no meaningful affect on pictorial aspects like detail, contrast, speed or grain.
If you use a stop bath, your development timing will be more carefully controlled, because stop baths stop development almost instantly. With the films you shoot, however, the biggest benefit may be that you will maximize the use of your fixer, and may make your film washing more efficient. I use and recommend a stop bath for modern films, but am happy to acknowledge that many people obtain excellent results using just a running water rinse between developer and fixer.
And by the way, the type of "sharpening" you achieve when processing a file obtained by scanning negatives is very different than the "sharpness" one can adjust by changing films or developers. Your three choices of developers will each balance well the sharpness, grain and speed you are able to achieve with your two films.
I use HC-110 in a replenishment regime, because I still have some (unfortunately discontinued) HC-110 replenisher. When I run out of the replenisher, I may switch to HC-110 one-shot, or may may switch to T-Max RS in a replenishment regime, or may switch to X-Tol in a replenishment regime. YMMV