Well what do ya think? Please give a reason ALONG with your vote. ThanxDebian - It works great for servers. SUSE - The only one I've ever used (pretty weak reason I know).It's the wrong question really. The best setup for a web server is one with minimal crud. You wouldn't do a full install of any of those DISTROS, if you were planning to deploy a production-grade Apache 2 server installation.

And as far as Linux distributions are concerned, there's very little between them, when you're only doing a minimal install.

I'd CONSIDER something like SUPERSuSE, due to it's claims of performance optimisations, but then again, it's bleeding-edge, and for that reason you wouldn't use it on mission-critical servers.For easy to use and low footprint ditro i would go with SME linux from http://contribs.org. Really easy to setup and configure.
it can also be used for:
* Sharing of a single Internet connection between multiple computers
* A network firewall to protect against Internet intruders
* A ROBUST email server, which INCLUDES virus and spam filtering and webmail
* File and print sharing
* Web application server, including support for MySQL, Perl and PHP
* Secure remote access
All the setup is donw via a web interface.