The simple fact is you pay for the operating system. The hardware is exactly the same and unless you feel the need to pay more for a pretty laptop then you buy an Apple for OSX.
Vista is useless compared to OSX and Win XP is another story all together. Ironically the only operating system I've seen close to OSX is Ubuntu 8.04.
The HW is not exactly the same. Apple usually source from reliable manufacturers and components (eg Memory and heat sinks) are done
to their specifications. It will be the same if you choose a reliable manufacturer or only buy some of the most expensive parts around yourself.
You know the PC market is awash with thousands of different Chinese OEM's
and so on, many of whom actively counterfeit their hardware. Apple at least checks for some of that, hopefully - as they take pride in their name, more
than can be said for many Chinese OEM's.
Macs have their role. I think MB's, MBP's and Mac Pros are great. Mac Pros are expensive but offer opportunity for upgrade eg I can plug in 2 Quad Core Xeons into my first gen Mac Pro, add more RAM, change the g-fx card, add HD video capture or SCSI/RAID cards etc. You can't do that with an iMac though, neither can you upgrade the screen. That really sucks about Apple. Secondly Macs are good at video editing and photo editing/gfx work plus usual run of the mill word processing but you can't do other things on them eg run CAD software. Still as is MacOSX is way better than XP and definately even more so than Vista.
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