I thought the difference between Sim City and Sim City 2000 was amazing. I thought Sim City 2000 was a much more refined version of the game idea. The graphics were better, the goals better, and many 'fun' things to get along the way.
I still play SC2k today but usually for Windows or under Mac emulation.
I know there was an AGA version of SC2k for the Amiga. I thought -could be wrong- that maybe the CD32 version of SC2k had better graphics but I could be wrong.
However, I know there is SC2k for AGA Amigas.
You might want to try that version out.
Cheers!
-P