Funny you should mention it! I actually prefer Approval voting, partially for its simplicity, partially because it elegantly represents Consent of the Governed. I sometimes don't bother mentioning Approval, because RCV has greater mindshare, and "Ranked Choice" is a little stickier from a branding perspective. I kind of wish there were a better overarching term to describe multiple voting; either way, the priority IMO is that we get off of First Past The Post.
I'll check out CES, thanks.