My rankings:
1. Predator
2. Prey
3. Predators and Predator 2 -- TIED! It really depends on my mood on which I like more. Some days it's Predators and others it's Predator 2, so I put them on the same field.
4. AvP
5. The Predator
6. AvP: R
I like the characters in The Predator more than AvP: R, so it just squeaks by as better.