Ok the OP was asking about a
laptop so I have no idea what PC desktop system building has to do with that. Since this is a photography forum, a Mac is the obvious choice since all Mac laptop screens have great and accurate color and contrast which is essential for photography. If there was a PC-based laptop that had an equally good screen then it'd be worth considering, but good luck finding it. The PC market is cost driven, and the only people that would know about and seek out a PC based laptop with a screen that's actually good enough for photography is probably buying a Mac anyways. Yeah it's part of the extra cost, but it's worth it. Bonuses with Mac: It has a built-in PDF writer, which I use almost all the time. This is $300 software for Windows. You don't need a resource hogging antivirus program that you have to keep paying to update every year, so that's more savings. A lot of the software included in Mac OS X is quite useful and has no equivalent in Windows, thus requiring you to buy yet more software. Yes, Macs are proprietary which makes them more expensive. The hidden benefit though is that the hardware is FAR more tightly controlled, the same company handles both hardware and software, and that helps to ensure that all of their gear actually works as it should with NO hidden surprises. The openness of the PC market is great and what drives prices so low, but with zillions of possible hardware combinations it's simply not possible to maintain nearly as high of quality control on the systems that Apple can. This is a big part of what makes Apples more stable, on top of having a much better OS. In the two years I've been using Macs, I have yet to see a system crash. I don't even know what one looks like, whereas I saw it quite frequently on my PC desktop and laptop systems. If you really get into advanced photo or especially VIDEO editing, some of these apps run ONLY on Mac, and most creative professionals use Mac. And there's absolutely nothing I can't do on my Mac either. I can even run Windoze!

In fact I
DO run Windoze too via Parallels virtual machine software. Can a PC do that?

The engineering world where I have a day job is all PC based, yet the creative world is Mac based, so I have a conflict. A Mac with Parallels and Windows is the perfect combination for me. In fact you don't even need extra software. OS X has Boot Camp software built-in to the OS to partition your drive for dual-booting if you don't happen to need to run both Mac and Windows at the same time.
As far as reliability and stability, no it's not simply a matter of knowing how to maintain your system properly. I've seen plenty of perfectly well maintained PCs crap out and need OS reinstallation or rebuilding, and then completely neglected ones that "surely" should have crashed that just keep going and going. And no amount of proper maintenance is going to prevent crashes and data loss when you have zillions of possible hardware combinations, some of which will conflict with each other, and due to cost pressures in the PC market they never really bother to test for. If they waste time testing something, it's already obsolete or they've added too much cost to their systems and now they're no longer competitive. Crappy GM cars from the 80's and 90's will still die an early death regardless of proper care, and then some keep going forever. It's a crap shoot and you never know what you're going to get. I'm laughing at my buddy who is an IT pro who just lost half a vacation worth of photos including his very best shots because Windoze hacked up his memory card. I've had the same thing happen to me. He's always joked about my "Crapple" but he's looking for one himself now. :mrgreen:
Anyways, there's no right or wrong answer. This is just like Nikon vs Canon. Anybody who tries to claim that one system is superior to the other automatically has no clue what they're talking about in my book. Mac works better for my needs, but the PC/Windows world still has their virtues and plenty of advantages too which have already been pointed out that one cannot ignore, and that I'm not going to repeat. If you're on a tight budget a PC may very well be the better choice. But it sounds like the OP may be willing to buy whatever and isn't very budget limited.