Staff or D/D
D/d if you’re running conditions since death blossom applies generous bleeding while deadly arts gives poison with dagger skills.
I run a power build however and I use staff, sword/dagger, and shortbow. It’s better overall personally I think because vault tends to have a quick launch making dodges more responsive though staff 3 is also a dodge but is harder to time properly. Staff 4 has a blind on it. Staff also has a better autoattack because you apply vulnerability stacks on the third move.