Ranked in these QuestionsQuestion Ranking
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 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.