Free Software Magazine has made a guide to why the Debian distro is a good choice. Excellent read.
Read the 4-page story here.
There are hundreds of GNU/Linux distributions around, each with its strengths and weaknesses. One that stands out from the masses is Debian. It is the only major distribution not developed (or even backed) by commercial vendors, but by a group of volunteers around the world. Its main features are robustness, great software package management, a huge software collection consisting of more than 15,000 pre-compiled packages ready to install and run, and a transparent and always helpful support system based on mailing lists and a bug tracking system.
…and that's only the start of the article!