Gameplay:
S3K > Sonic CD > Sonic 2 > Sonic > Knuckles Chaotix
Music
Sonic CD > S3K > Knuckles Chaotix > Sonic 2 > Sonic
Chaotix? I'd forgotten about that, although it isn't really Genesis, anyway.
I'm thinking more like:
gameplay:
S2 > S3&K > SCD > S&K Maybe Chaotix goes here, just after S&K, but maybe it should rank higher.
music:
S2 > SCD > S&K > Chaotix
Oh, and you are aware that this is the US Sonic CD, right? If you already noticed I said that,
CONGRATULATIONS! You have good taste in music, and you're someone who doesn't complain
about that version. :D (I don't doubt that the Japanese one has good music,
but there probably isn't as much of a difference as some people seem to think.)
Wait a minute... is Sonic CD that great? It's a little slower, and... no, wait... it has a Time Attack and stuff.
But then, I remember Chaotix being fast and fun, and having cool special stages.