Best class is the npc he don't need gears or gems or spend money and he service everyone for free -_- !!
Assassin dont do much damage like before so they are easier to kill now, even the geared ones. Archer is the best so far and I think mili too
All assassins I've ran into at vega hit just 5-10k smoke bomb and that's not even much. And I usually have just resil and stamina buff and normal petit. I don't see assassins as a threat now. The class I see as a threat right now is star gazers