I was surprised to see SC3k described as isometric like 2k. I recall versions after 2k being "look anywhere" 3D, but I guess I missed some versions. So many games, like Railroad Tycoon post RRT2 and Worms went full 3D and gameplay was never the same. I actually keep a Basilisk II System 7.5 Mac environment just so that I can play SC2k from time to time ...
A small frustration I have with playing old games is that the GOG/Steam version is always the PC original and the Mac versions almost always had far better sound and music and sometimes graphics.
But SimCity 3000 is from 1999, and the PC version was a normal Win9x game. I own (still have the CD) the SimCity 3000 Mac port, and it is not very good. Maxis didn't port it themselves, it was done by Software MacKiev. System requirements were quite high for the time, it was sluggish, often unstable, and the file open/save dialogs reused the Windows-style dialogs which was very awkward.
The soundtrack is great though.