Do you consider Arch Linux suitable for server environment? Its rolling release model and simplicity seems to be a good thing, because once you installed it, you do not need to reinstall like the release model from other distros.
But that constant upgrading does not cause stability problems? Although it is bleeding edge, Arch Linux uses the most recent STABLE version of software.
Best Answer
Probably the biggest issue with Arch as a server operating system is that it's not clear where and when applications may break after an upgrade. More often than not, you have to keep up with what's going on in the wiki and on the forums before doing any sort of upgrade; with Debian and CentOS, you can well assured that any upgrades won't break any applications, since more often than not, the upgrades done on the STABLE branch will be security/bug fixes.