When comparing Slax vs Parrot GNU/Linux, the Slant community recommends Parrot GNU/Linux for most people. In the question“What are the best Linux distributions for desktops?” Parrot GNU/Linux is ranked 37th while Slax is ranked 54th. The most important reason people chose Parrot GNU/Linux is:
It is compatible to Debian >=testing.
Specs
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Pros
Pro Persistent changes
Changes you make in the configuration persist if you run from USB.
Pro Pretty fast to boot up
It was considerably fast to turn on when booting from cd.

Pro Modules
Standard tar archives plus some simple shell scripting produces modules that you can load dynamically into the OS for added apps and functionality.
Pro Modern desktop

Pro Small footprint
About 200mb, but with a full KDE4 environment and loads of useful apps.
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.
Cons
Con Overly complicated HDD/SSD installation
While it has a nice layout Slax's lack of an installer tool like Tinycore's just can't be justified. It seems strange that it comes built in with programs that some users may not want, yet it doesn't have an easy way to install it. Due to its heavier use of RAM, built in software, and lack of an installer its hard to choose it over TC.
Con Works slowly on old computers
Con Infrequent releases
Since Slax is maintained by only one person, releases are not that frequent. So it may take a while to get bug fixes or new features once you start using it.
