Most definitly, the alien. Yeah Predators have long range weapons and the like, but that kinda makes it, against a marine difficult. As you have seen throughout the movies with Predators in them, what happens? Almost everyone dies besides 1 or 2. And in the meantime there like "Dude wtf is goin on round here?" Not the aliens. They silently drag their victims down a hallway or vent. Or they just headbite them. Aliens are also fast and agile. They blend in the the dark. Not the predators they have to rely on their cloaking device. And the aliens get a couple kills before everyone starts to notice or they make one big messy one! Also predators rely too much on their "honor" code. If the person they see dosent have a weapon, 10 minutes later he'll come back with a shotty along with some of his military freinds. Aliens are aggresive and also have cool designs to them, plus i beleive they have a really cool lifecycle. Predaliens are stronger than normal aliens and predators. The Praetorin is probably the second strongest and the queen the first. Just dont bring those aliens up to Sigourney Weaver though.
