A moderate computer user might only know the different versions of OS such as Windows XP, Windows Vista, and Windows 7. They aren’t aware that each version of Windows still can be categorized in a few versions such as Home Premium, Professional and Ultimate.
The cheapest version of Windows 7 is Windows 7 Home Edition, follow by Windows 7 Professional, and Windows 7 Ultimate.
For easy understanding, you can take a look at the figure below to see the comparison between Home Edition, Professional and Ultimate version of Windows 7.
Windows 7 Ultimate is of course the best choice if you have extra bucks in pocket; otherwise it’s better to have the Professional version. I don’t really recommend Windows 7 Home Premium since it lacks a lot of feature.