Debian is a preferred Linux release, that's used primarily on desktop machines, however a lot of people have started using it lately as a web server Operating System as well, because of the stability and protection it supplies. The latter is a direct result the fact that Debian is developed and supported by countless qualified volunteers around the globe, therefore any patch which is necessary to fix a particular issue is released in a few days. The very same community will also help with any question or problem which a user may ever have, since they can be contacted through electronic mail using e-mail lists and a qualified response will be sent in around 15-20 min. The advantage here is that your queries will be responded to by the same people who have developed the Operating System itself and they have a detailed knowledge of how it functions. As Debian is free, you won't have to pay any kind of license fees to use it and you can customize it as much as you want or need. This is valid for the Operating System as well as the 30.000+ software packages that are available for it.