The short answer from an IT pro who's worked with both systems for years is simply that the Mac IS better than a Windows Machine.
Here are some curious things to take into consideration:
The 64bit version of Windows 7 weighs in at 20gigs
The 64bit version of Mac OS X 10.6 weighs in at 7gigs
-As the core operating system goes, they have the same basic functionality so why is Windows so much bigger than Mac?
Windows doesn't come with any software like iMovie, iPhoto, iWeb or Garage Band. And Garage band is freaking amazing. To get that same functionality, you have to spend a lot more money or download buggy freeware - not ideal for the average consumer.
Do you use Google Calendar or a CalDAV account?
iCal instantly connects with ALL your Google Calendars or CalDAV accounts as well as all Delegate Calendars.
Windows doesn't. Even Office doesn't give you that ability. To allow Outlook to sync to your Google Calendar or CalDAV calendar you need a plugin that only allows you to sync ONLY your main calendar. So then you download Thunderbird from Mozilla, then you download the Lightning addition for calendaring and THEN you download a plugin that allows you to sync ALL your Google Calendars. This process can take up to an hour or more.
Or you just use iCal on your Mac.
If you look at equivalent systems with the same basic hardware as the Mac, you're really not paying much more for Apple products and you're getting iLife (which includes iMove, iPhoto, Garage Band and iWeb) without any additional cost. To get the same quality and functionality out of a cheap Windows machine, you end up paying for additional software making the cost difference between the "cheap PC" and the "Expensive Mac" negligible, and sometimes it costs you more.
Need an Office suite? iWork for $80 or the Home and Student edition of Office for $150. Really need Office? It's on the Mac. For the same Price.
Microsoft wants you to feel proud of yourself for being able to install that new printer driver while a Mac will just print to the new printer without the need for installing software. Same goes for Digital Cameras - you don't need any drivers or additional software - iPhoto opens up and you can import directly into it.
Ever try high end networking on a PC? It's a nightmare that the Mac makes easy to understand and implement. Networking wizards and constant questions confuse the average user, while on the Mac, it's just easy.
I have a Windows 7 partition on my Mac and I'm impressed with it for the most part, but I've had to jump through a whole lot of hoops to get even close to the same ability that came standard on my MacBook Pro with 10.6 installed.
Really need Windows? Buy a Mac and then install Windows in a Bootcamp partition OR get Parallels or VMWare or CrossOver and run the software you need while still in the Mac OS.
You want to know what computer science majors at MIT are using? Macs. In fact, Macs are at the top of the list (if not the number one computer) for computer use on MIT's campus. They have far more computing power and flexibility than Windows user give them credit for. Full Command Line Interface ability to control the entire OS as if it were a Unix Box, X11 and so forth.
Lastly, Macs retain the value a lot more than a Windows machine does. Sell it in four years you're still going to get a fairly sizable chunk of money for it.
Microsoft makes good software and a decent OS, the problem is that they don't do it as well as Apple.