Bit of a vague qn, but for me the fact that its a free version of RHEL, as that's the most widely used commercial Linux ie used by companies ie the one I'm most likely to need to know for my job.
https://en.wikipedia.org/wiki/CentOS
https://en.wikipedia.org/wiki/Red_Hat_Enterprise_Linux
(and of course the stability)
This is a little bit like the oft repeated 'what's the best distro (for me)' threads.
Try searching a few of them as well.
