Quite a common question asked at sites such as Reddit and Yahoo answers is “Which distro should I use?” and it is usually followed up by a brief set of requirements and the names of distributions that the user has heard of.
Users are confused when they first come to Linux about which distribution they should be using and I have heard people say “I was thinking of Ubuntu or Arch” or “I was thinking about Gentoo and how hard is it to use Linux From Scratch”.