Nixes don't hurt at all anymore, and have one stun. Avatar of War has a paralyze and 2 stuns which is way scarier than a puny nix. I guess you will learn that once you either get one/or learn how to use it. EDIT: wasn't meant to sound rude...just my opinion.
I used to think that when I get 3rd fairy, I'd be switching straight away to demon because that was what I was used to. Over the past few months though I have been loving sage. I usually always have chi when I need it without having to use a pot and I don't notice not having demon hailstorm, pitfall or stone rain anymore.