It depends on what your criteria is and what you are looking for in a computer.
I generally prefer Windows XP, but sadly this came out of support earlier this year so we all have to use Windows 7, 8 or Mac osx :)
Windows 7 Ubuntu 10.10 Mac OSX Lion
Windows 7 and Mac OSX Lion (coming this summer)
Windows 7 is an operating system. A Mac is a computer. A Mac can run Windows 7. The two things are not comparable.
Windows 7 by a lot.
Windows OS: Windows 7 XP Vista Mac: OSX Lion Leopard Chromebook: Chrominium Others: Ubuntu
Mac OS X Lion is better than Windows 7 because it is faster, doesn't get viruses, is a lot more secure and in my opinion has a better user interface. It's up to you though to decide which is better. Remember if you get a Mac you can run both Windows 7 and Mac OS.
To select which partition the Mac boots from hold down the Option key (alt) when you start up. In System Preferences select Startup Disk and then select the system you want to set as the default startup.
Windows 7 is slower than the new operating system Lion for Mac. Windows 7 has most of the features all macs have had in the past and they are way behind everything the Mac does. In 5 years Windows will be doing the stuff Mac has just done this year. My advice don't buy Windows 7 you can buy a Mac and put Windows 7 on a Mac for like $100. And you get way more features on a Mac than on Windows 7. So basically Lion is way better than Windows 7. Hope this helps :)
Windows can be installed and run on any Mac (and Ironically windows 7 runs better on a mac than on a PC due to how the graphics are set up)
System Preferences is available in when one Clicks Finder on the Desktop in MAC OSX.
Windows 7 will work on a recent Mac (See links below).