Personally I prefer Hivemind. There's no armor abilities and the maps are smaller with more confined corners and hallways. Plus, not everyone will be able to have a shotgun, and you burn through your ammo more than having a shotgun that'll keep you safe for the round if used wisely.
What are your thoughts if you enjoy the flood playlist. Flood or Hivemind?
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I got a Killionare with the saw on a Forge Island map :3