I only consider Alien, Aliens, and Alien 3 canon, though I am of the unpopular opinion that both Covenant and Prometheus are good films, just not good Alien films. Same goes for the AVP films, they're fun to watch and I consider them simply "what if" scenarios and not something that has actually happened.
For the Predator films, I count Predator, Predator 2, and Predators only, with the same view of AVP as for alien.
Both Resurrection and Prey do not seem to fit into the lore at all for me.