NS have been relevant since they have been introduced, while whatever meta comes next is going to stomp on DR. I would go with NS and get a good raid team out of it.
I'd probably go for Chewie if I were you because the Mil.F can help you get 1st in Fleet which is 400 crystals income daily. If you were already first in Fleet daily, then probably Malak.
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The only thing I can say about not having a solid NS team is that they may make them mandatory for something in the future