Sam Raimi is good at straight horror, the first evil dead proved that but even then his humor creeps in a little. I think he could make a good Alien movie but there would definitely be some morbid humor in it.
Drag me to hell showed he still got the horror chops but again there was humor in that and like evil dead, it dealt with demons, creatures that Raimi gives sadistic yet comedic personalities.
Xenomorphs don't have a sense of humor nor comedy so Raimi would have to constantly resist the urge to have the Xeno go "we are going to get you, we are going to get you, not another peep, time to go to sleep" lol
Peter Jackson would not be a bad choice but not sure an Alien films needs to be so grand and massive in scale, which is really why Prometheus and Covenant didn't do as good as expected.
James Cameron is a good choice as he likely would not rehash the earlier movies.
Perhaps Danny boyle or Neil Marshal as they have done decent horrors before.
