There was some talk before about the Falcon being the preferred music tool of the time. A quick look at the specs confirms this:
Falcon: 16-bit with 8 stereo channels.
Amiga1200: 8-bit with 4 stereo channels.
I don't know much about Atari's though. I'm just looking at the specs. I think Bloodline might know.
*EDIT: shhit he already posted.