First, I would like to note that an Apple is a PC. It is a brand for PCs. So the title should be "Apple vs Non-Apple PCs."
Second, I'm not really on one side or another for this. I'll use whatever is on hand and works. Doesn't really matter to me. But some seem willing to duel-to-the-death on this issue.
The amount of emotion this argument generates is quite amazing. What is it about Apple that causes this? What magical powers do they possess?
Here is what I think is at the heart of Apple-lovers (or at least how they began): Apple treats non-business customers astronomically better than other PC vendors. They treat you as a friend, an insider, a cool person. This...this is powerful magic.
It isn't the hardware specs (which is PC hardware); it's not the OS (it isn't strictly superior to any modern OS); it isn't an undying love for Steve Jobs (for most of us, at least).
Take the MacBook uni-body aluminum case, for example. It shows that they acknowledge that people do care about how their computers look. I don't mean care like "I'm so sorry about your boo-boo; let's go get some ice cream." I mean "hey were paying attention and smart enough to do something about it."
An even better example: the Apple Store. You walk in and employees are just standing there waiting to help you. You don't have to go find one; you don't have to sheepishly ask if you can interrupt them. They are standing right there. You have a problem with your iPhone, you bring it in. There are people to talk to to help with any Apple-related issue you might have. This is especially important to the not-so tech-savvy. Ridiculously important.
Pro-PC people: when you make fun of Apple in front of an Apple lover, you are insulting their friend. And when you insult and friend, you are insulting them. Last time I checked, people do not like to be insulted.