System runtime was one of the key points to use kubuntu, a very light distro on resources so we use that at our main database server and it works very well in high traffic also.

The gui is refreshing. If you are tired and bored of the default ubuntu gui but are not too keen on other distros then kubuntu is for you

Kubuntu (LTS) is my chosen Linux distro for heavy, productivity use. It's official and maintained by Ubuntu developers. The best thing about this is faster than usual Ubuntu because of the difference in GUI. The "K" stands for Plasma KDE, the GUI used. It is lightweight and highly customizable than Ubuntu's GNOME. Kubuntu can be a perfect choice for those who want to use Ubuntu but with a different user interface type. This distribution provides a good KDE experience with the solid core of Ubuntu at the center of the system.