Debian is a preferred Linux distribution, that's used mainly on PC's, still lots of people have started using it lately as a web server OS as well, due to the stability and protection it supplies. The latter is a direct result the fact that Debian is developed and supported by thousands of qualified volunteers worldwide, which means that any patch that's needed to fix some issue is released in a few days. The very same community can also help you with any question or problem that a user may ever have, since they can be contacted via electronic mail using mailing lists and a competent response will be sent in around 15-20 minutes. The advantage here is that all of your questions will be responded to by the same people who have designed the Operating System itself and they have an in-depth knowledge of how it functions. As Debian is absolutely 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 which are available for it.