When comparing Tails vs Slackware, the Slant community recommends Tails for most people. In the question“What are the best Linux distributions for desktops?” Tails is ranked 18th while Slackware is ranked 23rd.
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 Ideal to learn more of Linux
Pro Package management
Uses standard tar archives with shell scripting as packages.
Pro One more distro which is init based
Some users don't like to install systemd based distros because they increase booting and processing speed.
Uses stable, plain-vanilla packages from upstream.
Pro Strong adherence to UNIX Principals
Pro No systemd
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 Not User Friendly
Con Large size live ISO
One need to vain 3GB+ data for downloading one slackware ISO.