Wow, this thread is full of epic LOSE.
Seriously, it always makes me cringe whenever there's a Mac vs. PC debate.
First of all, the word PC stands for 'Personal Computer', so technically all Macs are PC's, and all PC's are... well, PC's
And second of all, if you have the nerve to come forward and say which one is better, you better be damn sure you know your shit because I can tell you right now, neither one is better or worse. They both serve their purposes. Although both can equally perform the same tasks, they each have their strengths and weaknesses. If you wanna survive in the computer world, you'd be best off knowing both. If you only know one, then cram it.
Also, the "myth" about not being able to upgrade a Mac is bull. I'm not a fanboy of either, I just state the facts; You may not be able to upgrade with 1st party pieces of hardware, but I can tell you right now my G5 is loaded with unauthorized hardware, as it's needed to be upgraded over the past couple years. From memory, to hard drives, to disc drives, to graphics cards, etc. it is very well possible.
Why do I use a Mac? I use it because I am fond of how the OS performs for the tasks I need to do -- I do heavy videography, programming, photography, etc, so the Mac is my unit of choice. However, I use Windows as well, mainly for my MS Office related work, as well as having to use it at work. All of the software we have at work I need to be able to run at home as well, so I use both.
And BoneMonkey, as for your gaming charts, you'll need to put Mac and PC together because the Mac runs Windows at 100% native speed. However, I wouldn't put them at the top, as the PC games have been lacking in quality lately. Plus, I'd rather play a 360 game over a PC game anyday, mainly because of the fact that I really only use my computers for business and programming