I agree with above posts. The game is really won or lost in the movement phase.
But there are two other points that puts it over WFB in my opinion.
1. Balance
KoW is not perfectly balanced, but MUCH better than Warhammer. Units are within a reasonable power level relative to each other. Almost every unit in the game is viable.
2. Multibasing
In KoW, a unit is a block of a predetermined size*. There is no need to make individual models. Therefor, you can model your unit onto a single big base, which not only is very practical when playing but also allows for interesting dioramas (google "kings of war dioramas").
*For example, a unit of basic orcs comes in three sizes - troop (5x2), regiment (5x4) and horde (10x4). As an orc sits on a 25mm square base, those units would have a 125x50mm, 125x100mm and 250x100mm footprint respectively. As long as the unit has the correct footprint, and it is clear what they are, it can be modeled (almost) freely.