I've not dug into the 5.6 version of the blog component yet, but I have
quite a bit of experience with the pre-5.6 version. To be honest, it's a
feature that I've had some struggles with extending or customizing, but
they seem to be making improvements version to version. For this reason,
I would recommend using whatever is most recent.Make sure to ensure that
your licensing supports use of this component, though. Sometimes that
can get a little tricky.