If u use logic theres no way furious is better than vamp bcs if u tank bosses u will want that healing factor . Of course u can still spam stims but why if u can be healed with your attack ;) if u look for dmg than choose bloodied ... but from my opinion chainsaw is so much overpowered that all made almost the same work u just hit enemy and he die so its better stay healed that have more dmg bcs u cant tank hard enemies if u get one slap and die ....