Why not make both??? Yes it would appear that most of the fans of each series want their favorite creature to have another film, I say make them both. I am a fan of both series but I prefer the Aliens more than the Predators, don't get me wrong they are both great monsters but the alien movies are what I like the best. Alien 5 and Predator 3 could be made within how ever many years they would need to be made, but I think that should be the best option. Although another AVP3 set in space would be a cool idea because we could see each monster's homeworld etc.