When comparing Trisquel GNU/Linux vs BlackArch, the Slant community recommends BlackArch for most people. In the question“What are the best Linux distributions for misanthropes?” BlackArch is ranked 37th while Trisquel GNU/Linux is ranked 59th. The most important reason people chose BlackArch is:
As of Feb. 26th, 2020 there are 2460 tools in the repository.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Polished look and feel
Fresh installation looks great.
Pro Reliable and working great out-of-the-box
It works on many machines. Really good.
Pro Good but not so good
There's been a lot of effort put in this project through the years, there is no question about it. It's 100% free and it's very user-friendly, but it being based on Ubuntu 16.04 isn't the best thing, as you are working with software that still is actual but the versions are not the newest.
Pro Large repository
As of Feb. 26th, 2020 there are 2460 tools in the repository.
Pro Better than ArchStrike
Contains many more tools than ArchStrike and far easier installation than ArchStrike
Pro Live session
You can run the OS from a LiveUSB.
Pro Arch-based
BlackArch is just normal Arch with tons of tools preinstalled
Pro Suitable for professionals
Cons
Con Avoid proprietary-only GPU drivers
GPUs without libre drivers are a problem (not fault of Trisquel, of course). Also Wi-Fi cards in the same vein.
Con Not beginner-friendly
Not great for newbies.
