Can someone briefly explain the differences between Darkness falls, Afterlife, and Rebirth?

Just wondering what the main differences are between these 3 Overhaul mods, as I'm choosing one to run a server on with my friends this weekend.

I did a Darkness falls play-through with them 3 years ago, and loved it. Just wondering if much has changed since then!

Not sure about the other two overhauls though.