Debian is a preferred Linux distribution, that's used mainly on PC's, however a lot of people have started using it lately as a web server OS too, because of the stability and protection it offers. The latter is a direct result the fact that Debian is developed and supported by countless qualified volunteers internationally, so any patch that's necessary to fix some issue is released in a matter of days. The very same community will also help with any question or issue that a user may ever experience, due to the fact that they can be contacted through electronic mail using mailing lists and a competent response will be sent in around 15-20 min. The advantage here is that your queries will be answered by the same people who have created the Operating System itself and they have an in-depth knowledge of how it functions. As Debian is free, you will not have to pay any kind of license fees to use it and you will be able to personalize it as much as you want or need. This is valid for both the Operating System as well as the 30.000+ software packages which are available for it.