Best AP tank Jungle?

Who is the best AP tank jungle right now? I believe it is a choice out of 3 (correct me if I am wrong) Amumu, Sejuani and Maokai. Amumu and Sejuan both have effective engage and mass CC, Maokai on the other hand has the ability to decrease the damage being taken not just for himself but for his whole team. Asking this question as I am trying to decide which champ to try and master, please post your thoughts
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