The question what your target is? if you need a lot of features you should probably aim for the big ones
wordpress as mentioned by Vikrant Singh Chauhan personally I don't like wordpress, but that's more of an aesthetics thing.
I wrote admin plugins in it and so on. I don't like the code and they remain backward compatible.
I like the more simpler CMS
this already features all I needed and even more
because there is no frontend logic included. So i can do whatever I want in the frontend but still have a data backend.
drupal.org remains one of the bigger players as well. They use symfony in the core. To me that's a plus.
typo3.org is used in a lot of government organisations, it's a very good choice as well.
concrete5.org is one of the newer and trends to my knowledge.
I personally like minimal things, less things to break, less things that are insecure.
but that's my taste.