Debian is a preferred Linux distribution, that is used mainly on PC's, however a lot of people have begun using it lately as a web server Operating System too, due to the stability and security it supplies. The latter is a result of the fact that Debian is developed and supported by countless qualified volunteers all around the world, therefore any patch that is required to fix a certain issue is released within a matter of days. The very same community can also help you with any question or trouble which a user may ever experience, since they can be contacted via e-mail using mailing lists and a qualified response will be sent in around 15-20 min. The advantage here is that all 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 free, you will not need to pay any license fees to use it and you will be able to personalize it as much as you want or need. This is valid for the Operating System and the 30.000+ software packages that are readily available for it.