right let see, it's varies on your choice and what you do, especially for a living.
I used a Macintosh because I prefer it for everyday stuff such as music (iTunes), internet (Safari), word processing (Word), presentation (Keynote), making music (Garageband), etc.
I also used it every now and then for Photoshop because frankly speaking, using Photoshop in a Macintosh felt more comfortable and more creative than on the PC, however a PC do tend to have a faster operational speed, the Macintosh will felt fast, but in reality the operational speed is not as fast as Windows (until now when Apple switch to Intel).
However, I used my PC for work, and a bit of everyday stuff, I don't have an anti-virus in it, sound insane didn't it? it's not if you know how to set up a good firewall, you can be completely virus-free and spy/adware-free too, anti-virus software are there to find and destroy viruses, not to stop them going into the computer.
my Windows machine (A Dell Dimension 3.40GHz) is bloody fast and perfect for rendering and encoding, but for everyday stuff, if you don't want the hassle of setting up firewall/anti-viruses and rather just get down to web browsing and such, a Macintosh is perfect.
Linux being user friendly is a myth, sure it's free and very customisable, it's the 'customisable' the problem.
My Linux box run flawless if you don't touch the CD-ROM
My new Linux is brilliant, just don't click on the log-out button
you need to know what you're doing, unlearn what you remember from Windows/Mac and relearn everything again with Linux, and not everyone want to do that.[/i]