Personally, I currently prefer Arch for the following reasons.

• AUR
• The Wiki
• The many vanilla packages
• Because you can easily create your own packages with the PKBGUILD files.
• Because, based on my own experience, Arch is quite usable despite the current packages.

If I had to choose another distribution, it would definitely be OpenSuse. Their rolling version, Tumbleweed, is also highly recommended.