AVPR is a movie that tries to be dramatic with its human characters, scary with Aliens and badass with Predators. And while I genuinely like Wolf (looks, body language, tech etc.) and wish the movie was dedicated to nothing but him hunting Aliens it fails to make me feel anything towards main human cast (apart from sheriff Morales, I like him). Human characters are just SO unimaginative and cliched to me I don't care for any of them dying. Whole teenagers love plot makes my skin crawl. Aliens are portrayed as dumb movie monsters that exist to scare children and to be killed by Wolf in a badass looking way which is NOT ACCEPTABLE.
The Predator is a movie that goes for goofy, light tone and it makes no mistake about what it is, it's very much self-aware what kind of movie it is. I mean, movie that has Predator spitting on the car, PredDogs, kid wearing a Predator mask for Halloween, bunch of crazy ex-militaries making pussy jokes and man shitting metal ball doesn't really ring "serious", does it ? And I root for each member of the Loonies more than for anybody in AVPR where I just wait for people to be killed in horrific way to laugh. I like characters interactions, I feel something when Lynch gets his hand blown off, Coyle and Baxlie shoot each other or when Nebraska throws himself in spaceship's engine. As for the Predators, It's fair, if you take movie's portrayal of them as mocking but IMO it doesn't really try to hide what it's doing
In the end of the day, both movies have their share of problems but I enjoyed the one that knew what it was and was more honest about it more