Dev paladin casts Sanctuary on SH, who casts Spirit guardians, clicks heels of Boots of speed and simply runs amok.
Sure, Ancients are a bit more mobile, have ranged ensnaring smite, better healing and access to AoE. But undead usually feature more than fiends; we haven't seen full utility of Divine sense/Turn unholy in EA. Sacred weapon is great choice for when moving into position.
Ancients edge Devotion, but I felt the latter was plenty powerful enough.