Debian is a preferred Linux release, that is used primarily on desktop machines, but a lot of people have begun using it lately as a web server OS too, because of the stability and security it supplies. The latter is a consequence of the fact that Debian is developed and supported by a large number of qualified volunteers worldwide, so any patch that's necessary to fix a certain issue is released within a matter of days. The same community will also help you with any question or issue that a user may ever encounter, because they can be contacted via e-mail using e-mail lists and a competent response will be sent in no more than 15-20 min. The advantage here is that all your questions will be addressed by the same people who have created the Operating System itself and they have an in-depth knowledge of how it works. As Debian is absolutely free, you will not have to pay any kind of license fees to use it and you will 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.