I personally think Thunderlord because of its firefly perk which Is good for taking out big hordes of enemies
Edit: Fatebringer seems to be a popular response at the moment, which is probably true, and thanks for so many responses :P
Edit: ermagerd 40 replies thx (this I what people do right?)
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Thunderlord. Not only does it do arc damage (for captains) It can also make enemies explode randomly. Invective will be nice for regenerating ammo. Shotguns are amazing in PvE now so it will also be a good choice.