Esther is like a hojillion times better than Daisy. Like, super duper better--there's a fair number of black units I would trade for Esther with zero hesitation. Esther is affected by her own AW ability and therefore has a 60+ seconds of uptime versus 25 seconds of downtime on her skill, during which she's dealing 700+ damage in an area at roughly three times the attack speed of the average mage or artillery officer. Throw in the fact that she ramps, has 100% withdraw and flies over melee units and you have the makings a top rate spawn camper. And I can't emphasize this enough: What I just described is Esther at her nadir of usefulness. Post SAW her skill gets better duration and a 1.5 damage modifier at the cost of some defense.