Tbh I like Scavengers better. It just makes existing drops give you more bang for what drops. But I do agree the HWAF needs a buff so it can be more effective in Heavy Weapon exotic set ups were you would think it should shine.
Instead HWAF shines when your using and exotic primary like Quicksilver or Wish-ender
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Both are a must when you want to refill ammo quickly. Scavengers only don't stack with Cenotaph bricks. But it doesn't really matter when you don't get ammo drops in general.