Actually, I carry a shank on me, at all times, just in case this debate breaks out and I have to shank a Mac-head!
Escher, when I'm in Seattle, I spend a lot of time around 4th & Lenora. Just giving you a fair warning.
Escher's response is very detailed, and that is good. My summation is a tad more simple.
For purposes of video editing, choosing between Mac and PC is like picking between six or one half-dozen of the other. Harmonica, half of a dozen is six, so I'm am saying that for this purpose, they are basically the same.
Here are the differences that matter.
Macs are expensive.
PCs have compatibility issues. This hardware doesn't work with that hardware. That hardware doesn't work with that software. Unless you are tech-savvy, you will have many headaches, and it will be less than half a year before your poorly-maintained PC is barely working.
And that is why I recommend harmonica get a Mac.
But there are all sorts of problems that come with a mac, such as sometimes if you upload footage you have no idea where it arrived and have to search the whole computer for it. That is one of dozens of organizing problems. And Mac's have to keep asking a lot of questions, before performing certain tasks. Questions that if you don't answer right, it could result in loss of data.
I uploaded all of my footage onto a PC and it went on, no problem. Then I try on my parents mac to compare, and it asks all sorts of questions and wouldn't let me proceed.
My Mac Pro is about 3 and a half years old now and running strong as ever.
Before that, I had 5 PC's over the course of 6 or so years. Some lasted longer than others. The ones that never touched the internet and never attempted a hardware upgrade once working. I did build them all, but when you put a new video card with old mobo or something seems like everything went to crap. The last one has the motherboard and processors die simultaneously about 4 months after I built it (to adobe premiere/matrox recommended hardware specs).
That's when I went Mac. A little more up front, but not a major problem at all. That's why, as long as Apple makes a powerhouse Mac (which may not me much longer) I'll be a Mac guy.
To be fair, windows 7 is supposed to have fixed most of the issues PC's have faced in the past. I never made it that far though.
Oh, and hardware costs more on a Mac, but software is waaaay less. The latest operating system is $29 vs $200+ for Windows 7 Pro and iWork is like $50 or something (may have changed), vs $150 for Office home & student. iWork ports to iPhone and iPad too making working on files on a the go a cinch.
The more expensive hardware, like Escher said, is better hardware too. You can't compare a $1300 MacBook to a $300 acer. To get similar parts you compare the $1300 MacBook to an $1100-1700 Alienware laptop.
But yes, both PC's (configured right, fingers crossed) and Mac's run Premiere great. They're both 64 bit now too.
PS: I surf the web on my Mac Pro (something that always lead to death on the PC's) without fear. I don't do anything malicious like BitTorrent or download random things, but havin Internet on my main creative device makes life sooo much easier. I have access to stock, can send files faster, and download and listen to new music in the BG when hammering away at After Effects. No problems so far.