Question : Debian or CentOS

Need opinions and ideas in comparing Debian and CentOS distributions for a hosting company that hosts dynamic and static websites with MySQL on 64bit and 4Gb rack server hardware. It would be better to be detailed technically both on stability, scalability and security.

Answer : Debian or CentOS

Debain and Centos both is a good destro
Some people use Debain and some poeple use Centos,

here, Redhat, Centos , Fedora is same category

DEbain and ubuntu is Same category

But both Centos and Debain, you will see everything is almost same, such as commands , file system, just few service base command there is little bit of difference. thats all

Stability wise both are same.
but docuemnts wise i think debain got more document in google then centos

but i prefer centos because i started of with Redhat,

http://toykeeper.net/soapbox/debian-redhat/
http://linux.derkeiler.com/Mailing-Lists/Debian/2008-02/msg02676.html

You can use Any debain or Centos but which ever you used try  to know it , try to know how  to handle problems  , where to get documentation, where to get patches, where to get security update.