Debian is a preferred Linux release, which is used mainly on PC's, but numerous people have begun using it lately as a web server OS as well, due to the stability and security it provides. The latter is a direct result the fact that Debian is developed and supported by thousands of qualified volunteers around the globe, therefore any patch that is necessary to fix a certain issue is released in a matter of days. The very same community can also help you with any question or trouble that a user may ever experience, due to the fact that they can be contacted through email using e-mail lists and a competent response will be sent in no more than 15-20 min. The advantage here is that all of 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 works. As Debian is absolutely free, you will not need to pay any license fees to use it and you'll be able to customize it as much as you want or need. This is valid for the Operating System and the 30.000+ software packages which are readily available for it.