Lead developer at Coral here (so some experience :P)
Coral is more suited typically to larger organizations trying to power multi-site community tools. It has a powerful moderation system that's all open source! It's probably overkill for a static blog or small site.
There's also Coral (https://github.com/coralproject/talk) which used to be Mozilla + Vox project before Mozilla handed it over to Vox completely, but I have no experience with it.