Aliens/Predator - Aliens is the perfect sequel and has more of an emotional core than Alien. Predator has amazing rewatch value, to me the most rewatchable film within the combined franchise
Alien
Predator 2 - major soft spot for this one and great rewatch value
Alien³/Prey
Predators
Alien Resurrection - torn between this and the Prometheus arc, but characters in this are less stupid
Alien Covenant/Prometheus - style over substance, idiotic characters esp in Prometheus
AvP/AvP Requiem - think these two films are bad in different ways but only Requiem has scenes so bad they're good, thinking of Jesse's ass, potheads getting DKed and people are dying, we need guns
The Predator - steaming pile, actually made me appreciate the AvP films