Personally I ususally run Rending claws, Devourer, Strangle Cannon....But if you have points for it, Twin Bone adds a lot to
CC, and Deathspitters are basicly Heavy Bolters that are assault.
Warriors currently are mostly a cheap, semi durable source of Synapse, and the cannon lets them snipe while camping. But late game, even a x3 Brood is a serious threat to depleted units, so they can do work then.
We May be getting a Codex soon so things might change, so take that in consideration, but if you toss a few Twin Bone swords, and or Deathspitters into units I don't think you'll later regret it.