Debian is a preferred Linux release, that is used mainly on personal computers, but a lot of people have started using it lately as a web server OS as well, due to the stability and protection it offers. The latter is a result of the fact that Debian is developed and supported by a large number of qualified volunteers all around the world, so any patch which is needed to fix a particular issue is released within a couple of days. The very same community can also help with any question or issue that a user may ever have, due to the fact that they can be contacted via email using mailing lists and a qualified response will be sent in no more than 15-20 min. The advantage here is that your queries will be responded to 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 will not have 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 which are readily available for it.