Excellent comparison of Commodore 64 Music Editors were published by Jen from Chordian. Jens created very detailed table that contain almost any details you can imagine and use.
I especially like important details like: how much CPU time (in scanlines) does a player from that editor use and how many SID chips does it support.
All that and many other details you can find Jens excellent table on the following link Comparison of C64 Music Editors
source: Jens Blog Chordian.net