Debian is a preferred Linux release, which is used mainly on PC's, still lots of people have begun using it lately as a web server OS too, due to the stability and protection it offers. The latter is a result of the fact that Debian is developed and supported by countless qualified volunteers internationally, which means that any patch which is required to fix some issue is released within a couple of days. The very same community can also help you with any question or trouble which a user may ever encounter, due to the fact that they can be contacted through e-mail using mailing lists and a competent response will be sent in around 15-20 minutes. The advantage here is that all of your questions will be responded to by the same people who have developed the Operating System itself and they have an in-depth knowledge of how it functions. As Debian is provided for 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 both the Operating System as well as the 30.000+ software packages that are readily available for it.