Back in the days I only used D76 but what would you recommend to use. I prefer fine grain.
You will get good results with D-76.
But if you want to exploit the full potential of TMX concerning detail rendition (fineness of grain, resolution, sharpness) - which is really a huge potential - then the old D-76 is simply outdated and cannot compete anymore with more recent, innovative and modern high-performance developers.
If you want to exploit the potentail fully I can recommend SPUR HRX, JOBO Alpha. And I would have a look to the just announced new SPUR Omega X, which has been designed to be even a bit better than the excellent HRX developer.
Besides the decision whether you want to exploit TMX' full detail rendition potential, you have to decide which curve shape of the characteristic curve you want to have.
TMX delivers in most developers a very straight linear characteristic curve. If you want that, perfect.
But the situation becomes a bit more challenging when you want to have a semi- or full compensating curve shape: To achieve that is more difficult with TMX, because even in several (semi)compensating developers, which deliver the compensating curves as intended with other films (e.g. Delta 100, which is very flexible in that regard), TMX keeps its straight linear CC.
You have to either use higher dilutions with these developers (and then often loose a bit effective film speed), or have change to a completely different developer.
So developer choice is a bit more difficult with TMX if you want a (semi)compensating curve. Less working choices.
Best regards,
Henning