Even if the performance differences are not significant, the user experience counts for a lot. Look around and you'll see people moaning and bitching about the Windows setups. I always used Windows and thought that was just part of computing- rebooting 1-2 times per day, having stuff crash on you, loosing data because you clicked Save but the stuff was never saved for unknown reasons, etc - but when I tried a Mac - the system just works.
It's rock solid. It never crashes. The only thing which crashed on me was
VLC and once Roxio's photo slideshow maker. The OS never dies. Now I still get peed off at Mac OSX for some things, eg
the interface is sometimes different to Windows, right click is OFF by default (I enabled it), and when an app
uses your DVD drive (eg DVD player is playing a movie but is PAUSED) you can't eject the disk, but overall the experience
with the MAC is better than with Windows, especially when dealing with Video rendering and DVD creation applications.
It's almost like you never even have to save your work until you actually quit the app at the end of what it is you've been doing.
The Mac Pro I'm using (quad core 3Ghz) is so quiet you can't tell its on, while my 2GB RAM 3.2GHz Pentium 4 machine next to it sounds
like a jet airliner taking off. Drives and memory are also easy to install, while on my PC it takes ages to install something and then you
find you pulled out one of the SATA cables and you waste another 15 minutes. Windows is also dead slow on my P4. It takes
a SATA 16MB cache drive/2GB DDR RAM/ATI Radeon9800Pro/3.2GHz Pentium4 HT machine 5-6 minutes to boot Windows XP
(despite disabling non-essential services, network stuff, spyware, malware, useless junk etc, it took like >10 minutes before).
On my Mac Pro the MAC OSX takes 30-40 seconds or less.