Why I use (and love) Ubuntu
Ubuntu and Gnome get out of your way
This is a big deal for me as I have a demanding job that means I need my system to just work and not bother me with configuration and complaints. Ubuntu and the Gnome desktop together work really well, the defaults are great and I know everything will just work so that I also may just work.
Compatibility with hardware
I am yet to come across any compatibility issues with hardware whilst using Ubuntu. This is great when I see colleagues and friends using Windows constantly hunting for compatible drivers for the right architecture and version of Windows whilst I know I can install Ubuntu on (almost) any machine and it will just work.
Discovering free software and choice
Free software is always good to have but the Ubuntu Software Centre just keeps getting better and better making it easier to discover new applications and utilities to make your Ubuntu experience better. This has become my primary platform for finding new software during the last two iterations of Ubuntu that have included many an update to the software centre. Although Ubuntu is shipped with a default set of software the choice is always there to use another media player, such as Banshee or another photo manager. The ability to remove components (even big ones like the desktop) is just as valuable as the ability to add them, choice is an advantage to any Linux desktop.
Media playback I don't have to worry about file formats, codecs, containers. Ubuntu will manage all this for me, it doesn't matter what sort of video or audio I am trying to play, it just works.
Design Ubuntu was very...brown when I started using it and it was not the prettiest looking desktop (by default) for a long time, but in the last two releases the design has come a long way with a new default theme that is almost a crime to change and a new font that looks amazing. It is only going to get better with the new Unity desktop that will be the default shell in Ubuntu 11.04.
Security Ubuntu and Linux is not targeted like Windows for malware and various other bad stuff. You will not have to constantly scan update and clean your system, you get security just by using it.
It's fresh With a new release every six months Ubuntu is always fresh and new and never goes stale. Updates are regular meaning your system is always secure and you are getting the new good stuff from the packages on your system. -- There are a ton of other reasons, such as the great dev tools, the ease with which you can set up a server, the super useful live USB and the massive community and plethora of ways you can get support.
The above are reasons why I love Ubuntu, based on my well established opinions. They may well be the reason why you don't.


