Arch is not quite a real-world-usable system IMHO, it breaks way too easily if you're not constantly updating it, which means that at some point you'll have to

Arch is not quite a real-world-usable system IMHO, it breaks way too easily if you're not constantly updating it, which means that at some point you'll have to reinstall from scratch. Debian Testing/Unstable just tends to work better (for a rolling distro) in my view. The Arch vs. Fedora comparison is not very sensible given how different the update models are... if you're ok with Fedora's update schedule it can be a fine choice.