DPS-wise, people are saying SAM is superior to all others.
Im under the impression that SAM is top and NIN is close enough that they are even if you factor raid utility. Honestly I do find SAM more forgiving because I live in Canada my Mudra lag is a little frustrating at times. and I like both katanas and sneaker daggers so its a really hard decision. I hate that I don't have kenki abilities to help me decide. Maybe I should take the SAM to 70 just to see if I like its full kit and then do the NIN right after or visc versa?

I do like the idea that a well played Ninja would get noticed for his utility aka good suiton trick attack timings.