Alien!! always Alien...
LoL... as a warrior ,I like Alien, especially Smooth dome xenomorph warrior or Drone...
I like Predator too anyway... But talking about hostile creature ,I feel Alien gotfar more impact on me...
the only thing I don like from predator is their lack of armor... I prefer them to use slightly full-armor like, hmmm... perhaps similar to middle earth jousting knight. Somehow their appearance and lack of armor always remind me more of barbarian rather than a warrior.
but I like their face, dreadlock, shuriken very much...
at first I always think alien rely on their sheer number, but after I saw AVP1, I begin to view alien differently. They are a powerful and deadly fast warrior. A clever xenomorph is apparently very dangerous to fight one on one combat, even a normal size xenomorph in AVP1 able to throw and pinned down large predator Celtic. No wonder yautja treat them as their primary nemesis for their hunt.
So I go w/ alien. especially on AVP1, while in AVP2 somehow they appear more stupid. They are charging forward without considering enemy's weapons. And alien in avp2 tend to rely on their secondary jaw and claw rather than their deadly tail. Somehow Alien in AVP2 have a rigged head.