When comparing Parrot GNU/Linux vs Kali Linux, the Slant community recommends Kali Linux for most people. In the question“What are the best Linux distributions for desktops?” Kali Linux is ranked 30th while Parrot GNU/Linux is ranked 37th. The most important reason people chose Kali Linux is:
Contains too many tools for hacking. Those tools are not already included in BackBox or ParrotOS.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Compatible with Debian
It is compatible to Debian >=testing.
Pro Testing based
It is always based on the latest testing release so it includes more recent software than a stable based distribution.
Pro Focuses just one desktop
It focus the MATE desktop which makes it unique compared to the more general distros.
Pro Better than ParrotOS, BackBox for hacking purpose
Contains too many tools for hacking. Those tools are not already included in BackBox or ParrotOS.
Pro Standard pentest tool set
Pro Live session distro used for forensics
Cons
Con Not intended to be a daily driver
This distro was written for pen testing and security work. It is not meant to be a day-to-day OS (unless that's your job).
Con Very old packages
E.G. Firefox's current version is 61 but Kali linux consists of its 52th version. Though kernel is not that old.