It is not a matter of software, but a matter of usability. Think of a Windows user only perspective. When installing a distro, you are confronted with the choice between X, KDE, Gnome, Compix, or whatever else Windows Manager is out there now, just to SHOW the Desktop. You haven't even started to use the OS and you must already make decisions about what to Window Manager to use. Most people don't even know what a Window Manager is. Now Google about them and all you will find are people that love their choice and diss all others and all of them seem wonderful in their eyes.