Xenomorphine: I say the Aliens won in AvP for the sheer fact that essentially, all three Unbloodeds, Celtic, Scar and Chopper immediately died during their first hunt. Chopper being the first, Celtic being the last-- and Scar, ended up being a host to the PredAlien. Technically, in retrospect, the Yautja lost in the events of AvP-- despite Scar being alive and being blooded after his first kill.