Debian is a preferred Linux distribution, which is used mainly on personal computers, still many people have begun using it lately as a web server OS too, due to the stability and security it supplies. The latter is a result of the fact that Debian is developed and supported by a large number of qualified volunteers worldwide, therefore any patch that is needed to fix some issue is released within a couple of days. The very same community will also help with any question or issue which a user may ever experience, because they can be contacted through e-mail using e-mail lists and a competent response will be sent in no more than 15-20 minutes. The advantage here is that your queries will be responded to by the same people who have designed the Operating System itself and they have a detailed knowledge of how it functions. As Debian is free, you will not have to pay any kind of license fees to use it and you'll be able to 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.