Depends on what you’re doing, but Gunslinger is pretty good for all situations; the super is good for PvP, if you have a Celestial Nighthawk, it’s the most powerful PvE attack in the game and the throwing knife melee is pretty handy
PvE - NightStalker w/Orpheus Rigs.
Perks: Way of the Trapper.
Side step: Reloads.
PvP - NightStalker w/Stompeez.
Perks: Way of the Trapper.
Side step: Reloads.
This is by far the best set up when equipped with Quickfang. Invisibility makes you a complete assassin.