When comparing Tails vs Devuan GNU+Linux, the Slant community recommends Tails for most people. In the question“What are the best Linux distributions for desktops?” Tails is ranked 18th while Devuan GNU+Linux is ranked 48th.
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 It's debian
Devuan is debian just without systemd, it just mirrors the the debian archive and repacks packages that have hard deps on systemd
Pro Init based
Isn't based on systemd which can spread malware into your system.
Pro Most decent look amongst other XFCE distros
Default XFCE theme is unique of all the XFCE distos including MXLinux, Xubuntu etc.
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 Impossibe to install on non-free hardware
Unlike Debian, Devuan offers no unfree install media so if your system needs unfree drivers(eg a laptop or a tablet) its nearly impossible to install devuan on it.