When comparing Slax vs Siduction, the Slant community recommends Siduction for most people. In the question“What are the best Debian-based Linux distributions?” Siduction is ranked 3rd while Slax is ranked 23rd. The most important reason people chose Siduction is:
Apt/Aptitude, debconf or the alternatives system.
Specs
Ranked in these QuestionsQuestion Ranking
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 Debian based
Apt/Aptitude, debconf or the alternatives system.
Pro Updates are slow, but stable. It is based on Debian after all.
It uses Unstable per default so it is still some kind of stable since all dangerous packages are tested in experimental first.
Pro Secure Boot support
It supports secure boot which is great for LiveCDs and dual boot systems.
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.
Con Hardware recognition is bad compared to Ubuntu.
Siduction won't install any non-free drivers by default.
