X vs. XP is a great website that takes what's probably the most comprehensive look yet at the mac vs windows war. It's completely unbiased because it assigns each part of the operating system a number, then adds up all of the numbers to a final score.
Also remember that neither OS is really better, both operating systems will practically do the same thing. It's up to your preference on how it gets done.
Finally, note that Macintosh will run Windows either at boot up, or simultaneously with OS X. You can even use the same partition, with Parallels 3 Software. Macs also come with iLife 07 which kicks ass.
See if any reasons Here can convince you.
Ooh, I'd also like to note that since the Mac runs Windows, this isn't a Mac vs. Windows thing, it's a "Which, out of two computers is junker," kind of thing. And the custom PC (That you are pointing out, of two choices) is junker because it has a slower, less power efficient, outdated processor.
( Edited on 11.02.2007 02:31 by MasterStyl )