Problem with Demons is that they play a mix of melee/ranged, which doesn't suit /Kin's playstyle. That alone is enough to go Necro over Demons. 5/6 of your zombies play in melee, which /Kin likes, and Lich won't benefit from +dmg anyway since he's mostly controls.
If it plays anything like Beast/Kin, it's fun, but be prepared to die a lot until you get your strategy down and build up your defenses/slotting.