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Thorn
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The thorn is more useful for PVE, unless you like using hand cannons for PVP, while the invective is more useful for PVP, so if you play PVP a lot get the shotgun, if you play PVE a lot get the hand cannon
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Thorn is harder to get but Invective is easier but Thorn is better
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One thing about invective since I've used it last is that in two shots I can take down a major (yellow health bar) hobgoblin which helps a lot