Debian is a preferred Linux distribution, that is used primarily on desktop machines, still lots of people have begun using it lately as a web server Operating System too, due to the stability and protection it supplies. The latter is a direct result the fact that Debian is developed and supported by countless qualified volunteers internationally, so any patch which is needed to fix a certain issue is released in a matter of days. The same community will also help with any question or issue that a user may ever encounter, as they can be contacted via electronic mail using e-mail lists and a competent response will be sent in no more than 15-20 min. The advantage here is that your questions will be answered by the same people who have created 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 license fees to use it and you'll be able to personalize 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 readily available for it.