I like both.
I like open standards which are the PC, less expensive parts and the ability to customize anything. Also easier to modify/hack parts and overclock. The pc is much more fun to build. The OS on the other hand needs some help. With the standard OS being Windows, their is definitely a lacking here, Linux has its advantages but some disadvantages as well, like a descent web browser.
I like the Mac because of the solidity of the platform. Each Mac is similar, they have compatible hardware accross the board, and they require no tweaking to be right. I wish there was an open Mac platform but that would affect the stability of the OS, OS X is a nice, solid, stable OS with a lot of things to envy, and not many to dislike. It has MSIE, which is the most web compatible browser(unfortunately), it is also quite nice to use and look at, everything is easy and elegant. OS X also has BSD underneath, which gives it a nice, strong networking stack, and memorymanagement. Pure staiblity. Something that closed hardware models excell at.
i dont like how Macs are expensive, i would love a dual 1ghz g4 tower, but $4000 can be spent on a couple very powerful PCs.