Board Thread:Legitimate Canon Questions/@comment-185.26.182.38-20140913152537/@comment-3425694-20140913172517

Physically, The Berserkers and Oni would be the strongest. However, if you have knowledge of their weaknesses, they are much easier to defeat, unless they're in numbers.

Mentally, the Nogitsune/Kitsune is the strongest. For obvious reasons you already know.

Everything else (Speed, Agility, Defense) I agree with Mgc2613, it would be a coin toss between the Kanima and Werejaguar.

So the strongest species really has to do with what you believe to be the greatest atribute. To answer the question plain and simply, I'd go with the Berserker or the Oni if we're going by strength alone. Overall, I'd go with the Kanima.