Carmack on why Mac
Overall, I'm a pretty big proponent of the Apple hardware," said Carmack, who said that his products run well on Macintosh G3 computers. "But a lot of Mac people do blind themselves as to the quantifiable performance. No one can honestly say [Macs] are faster than the PC--or even as fast." He called the iMac "marginally acceptable"--dangerously faint praise in an environment where fast, cheap PCs are ubiquitous.
And another quote on why he wants to support the Mac:
"I'm [supporting the Mac] because it's the technically right thing to do, and to support people outside the mainstream," said Carmack. "Microsoft dominating everything with what is basically an inferior technology would be a very bad thing."