Ranked in these QuestionsQuestion Ranking
Pro Debian based
Apt/Aptitude, debconf or the alternatives system.
Pro Updates are slow, but stable. It is based on Debian after all.
It uses Unstable per default so it is still some kind of stable since all dangerous packages are tested in experimental first.
Pro Secure Boot support
It supports secure boot which is great for LiveCDs and dual boot systems.
Con Hardware recognition is bad compared to Ubuntu.
Siduction won't install any non-free drivers by default.