Last word is full-auto and fully upgraded with stability can fire very accurately from the hip. It is great, reliable burst and able to overpower most other weapons in close-med range. Last-word suffers in PvE as it blows through ammo and has pretty bad range meaning you'll need to be close to do any decent damage. Fatebringer is better in PvE because it has better range / impact / clip / arc damage plus the perks are awesome. Explosive-rounds stagger often and precision kills causing both enemies to explode and super fast reload means it can keep the DPS up. A fully upgraded fatebringer can 2-3 shot most of the yellow trash mobs in HM VoG and it wrecks anything in this week's nightfall due to arc.