Debian is a preferred Linux release, that's used mainly on desktop machines, but many people have started using it lately as a web server OS as well, because of the stability and security it provides. The latter is a direct result the fact that Debian is developed and supported by numerous qualified volunteers internationally, so that any patch which is necessary to fix a certain issue is released in a couple of days. The very same community can also help you with any question or trouble which a user may ever encounter, due to the fact that 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 all of your queries will be addressed 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 free, you won't need to pay any kind of license fees to use it and you will be able to customize it as much as you want or need. This is valid for both the Operating System and the 30.000+ software packages that are available for it.