Debian is a widespread Linux release, that is used mainly on personal computers, still many people have begun using it lately as a web server Operating System as well, due to the stability and security it offers. The latter is a direct result the fact that Debian is developed and supported by thousands of qualified volunteers all around the world, which means that any patch that's necessary to fix a particular issue is released in a few days. The very same community will also help with any question or problem which a user may ever experience, since they can be contacted via electronic mail using e-mail lists and a competent response will be sent in no more than 15-20 min. The advantage here is that your questions will be addressed by the same people who have created the Operating System itself and they have an in-depth knowledge of how it works. As Debian is provided for free, you won't 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 which are available for it.