I've known people in authority positions who have insisted on CentOS because "red hat certification", "tested for enterprise" etc, whose first setup step is to enable EPEL and a bunch of 3rd party repos.
They don't seem to see how this negates the advantage of using a "well tested, enterprise grade" distro!
I much prefer Debian (for servers and development machines) as a good intersection between "up to date" and "stable".