What makes KDE great, and the best DE in my opinion are:
- The fact that it is based Qt. Qt is a c++ framework that is a joy to code with. It is well thought out, well supported and looks native on all platforms.
- Configuration options and settings. KDE has them all and some more. You can spend days going through all the options for the desktop and the KDE apps, getting everything just right. Getting it the way YOU want it and not how one developer envisioned it should be.
- KDE looks great, it uses by default the proven WIMP layout that is intuitive and does not get in your way or limits your options. However due to its massive amount of configuration settings and options, you can make KDE look and behave in completely different and interesting ways.
- It has a very supportive community and a large (compared to the other opensource desktops) developer base.
- Some of the greatest Linux apps are native KDE apps; these include but are not limited to: Amarok Music Player, K3b Disc Writing Software, Dolphin File Browser and the Krita Digital Painting Application.