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Bloodbrides can either be Bloodbride Hunters or Bloodbride Breakers.
All witches and bloodbrides get Poisoned attacks (4+), and counterattack on top of what they currently have (I think, remember I'm working off memory here)
Bloodbride hunters are your anti heavy infantry/monstrous creature. They get Precision Strikes, Rend, and Monster Hunter and are outfitted with haywire grenades.
Bloodbride Breakers are anti-horde specialists. They get Rampage, Preferred Enemy, and Rage and are outfitted with defensive grenades.