Windows 7 by a lot.
Windows 7 is an operating system. A Mac is a computer. A Mac can run Windows 7. The two things are not comparable.
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.
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 :)
It depends on what your criteria is and what you are looking for in a computer.
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)
Windows 7 will work on a recent Mac (See links below).
Macs do not come windows ,only PC's come windows so no a macbook does not have windows 7. However, I heard that Macs can run Windows as smoothly as a PC so you could probably buy windows for it.
Mac OS X 10.6 still beats Windows. Mac OS X 10.6 systems are more stable and secure than any Windows, and this has been proven. 10.6 still beats Windows in performance. It is also in my opinion more useable than Windows 7.
Windows 7 can be installed on any Mac that has an Intel processor (See links below).
Mahjong Titans is a Microsoft game for Windows Vista and Windows 7. You can't play it on Mac but you can play with the freeware Mahjong Mac In Poculis which is far better than Mahjong Titans.
No, and using windows 7 is not legal
Yes, you need to install Windows 7 onto Bootcamp (which comes free with the mac) or parallels, which you can buy. Then you can boot into Windows 7 or Mac OS X.