When comparing MX-Linux vs ArchLinux32, the Slant community recommends MX-Linux for most people. In the question“What are the best Linux distros for old notebooks/laptops?” MX-Linux is ranked 5th while ArchLinux32 is ranked 12th.
Ranked in these QuestionsQuestion Ranking
Pro Easy install
Pro Supports non-free drivers
Pro Easy to use
Pro No systemd
Pro Good MX Tools and Package Installer
MX Linux comes with its own set of tools called MX Tools, designed to make life easier for users.
Pro Very stable
Pro Based on Debian
Pro Great Documentation
For the most part, documentation of ArchLinux can be applied to ArchLinux32.
Pro Arch User Repository
AUR still works here, and if package you desire still supports i386 architecture, you can have it on your installation.
Con Remixed debian testing
It's mainly a debian stable with some recompiled/backported debian testing packages.
Con Only one Desktop Environment
Con Causes overheating on some hardwares
Other debian based XFCE distros- Xubuntu, Debian XFCE, Devuan leave small footprint on system whereas MXLinux uses too much CPU resources on same system.
Con Small communitry
Community behind ArchLinux32 is much smaller than behind ArchLinux. This makes problems occur more often, and solutions for those problems do take some time.
Con Had for non-patient people
Arch Linux 32, just like Arch Linux, requires careful studying documentation.