@the_legendary_supersaiyan_hulk: Hmm, I don't know very much about the Martian Roaches, but I'm confident to say that the Xenos will put up a hell of a fight especially if we go by the EU Xenos in the Aliens and AvP series.
To sum up how powerful Xenos are (based on movie and EU feats), Xeno Warriors have the strength to punch down and leave dents in futuristic metal security doors and casually rip apart Humans at the waist. They have the durability that they are bulletproof to anything that isn't heavy armor piercing/explosive weapons and can tank numerous strikes from Predators. Their reflexes and agility is so fast that are capable of dodging faster shoulder cannon models at close range and point blank along with dodging bullets as well at close range and a shotgun blast at point blank.
The claws, inner jaw, and tails of any caste of Xenos allows them to effortlessly slice right through Colonial Marine armor, Predator armor, and Combat Androids integrated with armor that could withstand sustained pulse rifle fire.
As for their intelligence, it can range from multiple IQs even with the same host species. The basic Xeno castes (Drone, Warrior, Runner), could range from the IQ of dogs/wolves/dinosaurs to the IQ of chimpanzees. The average IQ is often in between these lines of intelligence. Furthermore, Xenos have shown the intelligence to actually create combat plans, solve relatively complex problems, and operate machinery at a basic level.
Though the higher castes (Praetorian, Queen, Matriarch/Empress) have superior levels of intelligence to the basic castes.
The Queen was stated to have an IQ around 150 in Alien Resurrection.
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