I've tried to use Markdown for very simple formatting (to have two consecutive paragraph have a wrapper style, e.g. to have a note style) - and failed. I've tried various parsers, wrote my code hacks (also called: extensions), regex replacers whatnot, just to conclude, that even if I am able to do that, the live preview will suck.

Fast-forward today: I've started to use Asciidoc with the Atom editor and its Asciidoc live preview. I'm using asciidoctor to generate docbook, and xslt to get it formatted in the way I want. I feel productive to write the content, and I can control every aspect of the output, in the very specific way I see fit.

A simple blog post with a bunch of paragraphs and bold styles may not be worth it, but anything more complex will favor asciidoc.