Microdol-X is like a Haute Medoc. It goes best with a fine film - TMax100, PanF or the late Panatomic-X.
Despite protestations to the contrary, fine grain developers do go with fine grain films. When used with coarse grained film the high solvent action just makes for mushy grain and fuzzy pictures. Fine grain and high sharpness films have no need of sharply defined grain and (largely imaginary) edge effects and actuance to lend a false sense of detail. Microdol-X is also a low contrast developer - helping to tame the high contrast associated with very slow speed films.
Using it with high speed films is a bit of a contradiction. The speed loss with Microdol is more apparent in high speed films, and you would be better off using a slower film and a speed-enhancing developer. Most super-speed 3200 films are really 800 speed films that take well to pushing, and Microdol isn't anybody's first choice as a 'push' developer, though it has some application pushing very contrasty scenes with thick emulsion films as it limits highlight density.
I used to rather like it with Tri-X because it takes the gritty edge off this film - but you have to be very careful not to overexpose or overdevelop.
All that aside, there is no reason not to use it with any film you choose. Experiment with using it full strength or 1:3. There is no one who can tell you what you will or will not like.