Best Dual-Color Planeswalker?

Thoughts on which dual-color Planeswalker is most powerful or versatile or useful? I've maxed the original 5 monocolor PWs; I'm looking for what next.
As of this writing we have three multicolor options:
Kiora MotD

Sarkhan the Mad

Ajani Vengeant
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As of this writing we have three multicolor options:
Kiora MotD


Sarkhan the Mad


Ajani Vengeant


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