Debian is a preferred Linux release, that's used primarily on desktop machines, however numerous people have begun using it lately as a web server OS too, because of the stability and protection it provides. The latter is a consequence of the fact that Debian is developed and supported by countless qualified volunteers internationally, so any patch that is necessary to fix a particular issue is released within a couple of days. The very same community will also help with any question or issue which a user may ever encounter, due to the fact that they can be contacted through e-mail using e-mail lists and a qualified response will be sent in around 15-20 min. The advantage here is that all of your queries will be replied by the same people who have created the Operating System itself and they have a detailed knowledge of how it works. As Debian is absolutely free, you won't need to pay any kind of license fees to use it and you'll be able to customize it as much as you want or need. This is valid for both the Operating System and the 30.000+ software packages that are readily available for it.