To me it looks Atari was preferred by professionals and Amiga by amateurs :-)
I mean, music productions created on Amiga are mostly mod songs while on Atari some composers got their creations to hit charts.
Michael Münzing und Luca Anzilotti were using Amiga and hit with some of their stuff the charts pretty successfully. SNAP was their commercially most successful project (The Power went #1 in many countries). But from the Amiga POV their project "16 Bit" is most interesting. The covers are just advertizing and praising the Amiga.
