I complety agree with you Avanze. The MD had some really nice music, but also there were a lot of tunes somehow 'converted' for the chip, which sounded quite bad. The SNES chip was a very great synthesizer and some of the sounds I will never forget (Secret of Mana for example).
The Amiga use of samples made it so different that it's hard to compare the music/sound to these both consoles.
As for the NeoGeo : Yes, maybe that the closest thing to a Amiga (I hate to say it, but it's even 'a little bit' better [just GFX and sound]