Debian is a widespread Linux release, which is used mainly on PC's, still many people have started using it lately as a web server OS too, because of the stability and security it supplies. The latter is a direct result the fact that Debian is developed and supported by a large number of qualified volunteers all around the world, so that any patch that is needed to fix a certain issue is released within a few days. The very same community can also help you with any question or trouble that a user may ever encounter, as they can be contacted via e-mail using e-mail lists and a qualified response will be sent in no more than 15-20 minutes. The advantage here is that your questions 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 provided for free, you won't have to pay any license fees to use it and you can 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.