Debian is a widespread Linux release, which is used mainly on personal computers, still numerous people have started using it lately as a web server Operating System too, due to the stability and security it offers. The latter is a direct result the fact that Debian is developed and supported by countless qualified volunteers around the globe, so that any patch that is necessary to fix a certain issue is released in a matter of days. The very same community will also help with any question or problem that a user may ever have, since they can be contacted via e-mail using mailing lists and a competent response will be sent in no more than 15-20 min. The advantage here is that all of your queries will be responded to by the same people who have made the Operating System itself and they have an in-depth knowledge of how it works. As Debian is free, you won't need to pay any license fees to use it and you can personalize it as much as you want or need. This is valid for both the Operating System and the 30.000+ software packages which are readily available for it.