As me, i'm using dual boot of Windows XP and 7.
I most preferring Windows 7 than Windows XP.
If you skipped over Windows Vista like so many others have, you may be in a shock when you upgrade from Windows XP to Windows 7. Windows 7 now have a lot of new features, tool, start menu and so many thing had been change on display and i can tell you this, it will not be done with mercy.
It's also depend on your PC. If you have low specification like 512 MB of RAM and 1.51 GHz i don't think it suit with Windows 7. Well just said that cause i have it before.
So anyway, back to the topic, I'm updating it by myself with format. It was a piece of cake to do that.
You can check here for more information.
Code:
http://helpdeskgeek.com/windows-7/differences-between-windows-xp-and-windows-7/