14 years ago
Aliens & predators are obviously both physically powerful, & certain variants of adult alien would more than likely be able to overpower almost anything they wanted (such as a predalien), although to keep things as balanced as possible, this comparison will be between a predator & a standard drone/warrior.
It has been shown that both creatures are easily capable of manhandling not only humans, but also each other. Grid lifted Chopper off the ground using only his tail, which is no small feat considering that predators generally weigh well over 300lbs, by the same principal though, Celtic tossed Grid around like a paperweight, without the slightest sign of strain, & "The Wolf" has been shown to lift an alien off the ground with a single hand (lifting 2 at once), which would weigh around 180-200lbs each.
Judging from these examples alone, they seem relatively evenly matched in strength, although one great example of pure power was in AVP when Scar grabbed hold of the chain which was attached to the Queen & actually pulled her backwards for a few seconds, considering she would weigh well over a tonne, this is no small feat. I simply could not envision a lone xenomorph having the strength to do this.Although it should be noted that the Queen was injured at the time, which could have made her more susceptible to being pulled backwards by the chain, nevertheless, it was still an impressive display of strength.