When comparing Tails vs BlackArch, the Slant community recommends Tails for most people. In the question“What are the best Linux distributions for misanthropes?” Tails is ranked 25th while BlackArch is ranked 37th.
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 Easy to use with an USB key
Pro Large repository
As of Feb. 26th, 2020 there are 2460 tools in the repository.
Pro Suitable for professionals
Pro Live session
You can run the OS from a LiveUSB.
Pro Better than ArchStrike
Contains many more tools than ArchStrike and far easier installation than ArchStrike
BlackArch is just normal Arch with tons of tools preinstalled
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 You can't install it to a hard drive
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 Only GNOME desktop environment
Con Slow internet
Tails uses the TOR network and as a result the internet on your computer will be very slow.
Con Not beginner-friendly
Not great for newbies.