I like the ONML music. About as much as I as the original one.
The original music has much more variety of course, and since there are more tracks, there are more really good tracks, but also some I really can't stand (by name the CanCan & Mountain, I think I heard them far too often and now it is annoying for me (the Genesis versions of these are ok for me however), Doggie, these strange noise sounds really bad, I don't really like Tim5 either), which ONML hasn't.
And yes, I prefer the DOS versions of the ONML tracks...which reminds me to ask: is there a way to extract the adlib samples out of a .dro file? I don't know anything about this format.