I have an MT32-pi, but only a handful of X68000 games work with it in the current core (hopefully this will change in the future, would be willing to donate money or free JP<->EN translations to anyone working on it).
Found a good deal on a Roland SC-55ST. Can I assume that works with more games? If so, is it about the same as real hardware (if the game otherwise works in the current core)? Will probably get it anyway just to compare how it sounds with the MT32-pi.
Would there be any difference between using a USB adapter like the Roland UM-ONE-MK2, and the Legacypixels MiSTer MIDI which uses the user port?