I wouldn’t ask just one side :D
Macs are, at their programming base, much more stable.
BUT,
Macs are, simply put, PCs (despite the ads that make them look like a completely different breed) since PC means ‘personal computer’, and that’s what they are.
Ever since Apple decided to use Intel processors, over PowerPC architectures*(stay with me!)* they are simply PC’s, with a different Operating System-namely, Mac OS Leopard instead of Windows.
That is the primary difference, besides Apple’s excellent tech support and warranties(eg: Apple Care). PCs can all run other Operating Systems, like Windows XP, Windows Vista, Mac OSX, Ubuntu… – but Apple made Mac OS hard to run on anything but it’s own hardware.
Macs, however, don’t get viruses, rarely crash, etc. But they are just PCs, with a better operating system. I installed www.ubuntu.com on my machines instead of Vista/XP, and it works great, but needs a bit of work before it competes with Mac. I suggest Mac’s for the average user.
Go to www.easygeek.org for some info on that.