Lik Hyriu said, its a matter of preference since you can tank with either.
I prefer Pld since I have more to work with and I like being able to spam cures for hate. Another thing that helps is that alot of my gear for Pld can be used for Drg & Drk whereas I don't have any other jobs to really use Nin gear on.
The only time I really use Nin anymore is for camping Ixion due to the movement speed and throwing skill.
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