I am one of those guys who try moving everything to Emacs, but personally I found Anki to be much better than org-drill just for the simple reason that I can go through the cards quickly using the phone app when I have some time (waiting for someone, something, etc.). With org-drill I have to be in front of my machine.
But yeah, I've pretty much sold to org-mode. I, too, have been creating a knowledge base inside org-mode. This contains the deeper knowledge and explanations, while the tidbits are in Anki. Org mode notes are like fat nodes, and Anki cards are the threads which bind them. I personally have found both to be very useful together.