When comparing Tails vs Siduction, the Slant community recommends Tails for most people. In the question“What are the best Linux distributions for Misanthropes?” Tails is ranked 11th while Siduction is ranked 79th.
Ranked in these QuestionsQuestion Ranking
Pro Privacy focused
Pro Has TOR built-in
Use the Internet anonymously and circumvent censorship; all connections to the Internet are forced to go through the Tor network.
Pro Debian based
Apt/Aptitude, debconf or the alternatives system.
Pro Secure Boot support
It supports secure boot which is great for LiveCDs and dual boot systems.
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.
Con Not for daily use
Tails is a privacy focused Linux distro. The updates that you will receive are only for improving privacy and not for improving user experience.
Con Saved states are not present for security
For security reasons, saved states are not supported in Tails. Files can be stored in a separate, persistent volume which must be accessed with a root password. Personal settings (e.g. -- keyboard layout, window settings, etc.) are not saved persistently across reboots. This can be a hindrance for anyone not using English as their language, or not using a QWERTY keyboard layout.
Con You can't install it to a hard drive
Con Slow internet
Tails uses the TOR network and as a result the internet on your computer will be very slow.
Con Only GNOME desktop environment
Con Hardware recognition is bad compared to Ubuntu.
Siduction won't install any non-free drivers by default.