Debian is a widespread Linux distribution, which is used primarily on PC's, still many 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 a large number of qualified volunteers all around the world, so that any patch that's needed to fix a certain issue is released in a few days. The very same community can also help you with any question or issue that a user may ever experience, since they can be contacted through electronic mail using e-mail lists and a competent response will be sent in around 15-20 minutes. The advantage here is that all your questions will be addressed by the same people who have developed the Operating System itself and they have a detailed knowledge of how it functions. As Debian is 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 both the Operating System as well as the 30.000+ software packages that are readily available for it.
