Strongly leaning towards Necrolords because AL looks good for PVP. I also was considering trying to push for Mythic Raiding in SL after having my first taste of it again in 8.3 since WoD and missing it and friends moving that way, so if Night Fae ends up being broken, maybe I'll head that way.
Short summary, whichever is best for PVP/PVE. Not even slightly looking forward to it.