For music, I would always go for a polished/mixed/mastered OGG, rather than a trackerformat, midifile etc.
In the mix there's so much you can do to make it sound great instead of dull. aLso consider this: do your customers (ppl buying games) have the ultimate hi-fi equipment, or do they have dull multimedia-speakers? If you count on the last case, you can use the mixing/mastering-process to optimize the sound for small speakers.. think about the low-frequency stuff!
In the mix there's so much you can do to make it sound great instead of dull. aLso consider this: do your customers (ppl buying games) have the ultimate hi-fi equipment, or do they have dull multimedia-speakers? If you count on the last case, you can use the mixing/mastering-process to optimize the sound for small speakers.. think about the low-frequency stuff!