What weapon proficiency do you guys use for assassins?

My thought is that there are two approaches here.

Big(ish) damage, but slower weapon - long sword, crossbow, two weapon style

vs

Small damage, but fast weapon - dagger, darts, two weapon style

The first can take advantage of a big juicy backstab multiplier, while the second can take advantage of more APR and therefore more poison hits.

I should also note that I’m planning on playing with the rogue rebalancing mod

they live and die by backstab so you want a staff
put a pip in twohanded and go get the +3 magic staff to see you through most of the game or at least as long as you manage to keep him alive ;)