I tried posting, but my internet crashed.
PC all the way. I've used both, and PC's outstripe in my book for many reasons.
First and foremost, cost vs quality.
If you want something safe and all that, run Linux for free, instead of spending 3k on a Mac that can cost you 1.5 with Linux. Mac's truly are for people who just want things EASY and done for them. Who don't want to think, and want everything all pretty.
Hell for that matter, Ubuntu can do all that + cool stuff like Beryl and the like.
Also, when it comes down to gaming, hands down Windows. You wont see any serious gamers on Macs because the support isn't there, and the overhead is actually quite a bit. You talk about loading times? Learn to not be an idiot. All my PC's start up fast because I don't let spyware and extra crap on it. Sure Windows will get that stuff and mac's wont: but Mac's aren't being targeted; they dont have the market share to make it work a hackers trouble to write code for their Kernel. They can still be hacked, people just don't normally bother learning. It's much more convenient to know how to Hack a Windows system: And don't even bother trying to hack a Linux box.
Note: Linux = PC to me.
And finally: Vista. Honestly it's a good OS. Overhead? Of course, but they said the same thing about XP when it was released. Security? is actually good now, took some time and with SP1 coming out, it'll be even better. Takes some getting used to, but I've been running it since Beta 2 and love it.
PC all the way. Sidenote: at ITT Tech where I attend school, we learn Linux and Windows: Our Mac's literally have dust on them, and are only used once in a great while by the Graphic Art students. Honestly it's kinda sad because 100% of Mac's are VERY GOOD in terms of hardware; they have some serious balls - and need them to run OSX (And would run Vista easily)
Therein lies another problem with Mac's, they need specific hardware to run OSX. Kinda crappy. Install Linux some time, and let your jaw drop when it detects every bit of hardware right down to the weird off brand monitor you're using.