ALIENS is less stalked and taken one by one. You have the squad get cut down in larger numbers, like, 3-4 at a time. There's the initial attack when, like, half the squad gets taken. Then you have the standoff in the lab when Hudson, Vasquez, Gorman, and Burke get taken. After that, pretty much everyone survives in one form or another.
My point about the war film thing, though, is twofold. First, the marines actually put up a halfway decent defense and fight off the enemy force after the initial ambush. Second, a HUGE part of the film is focused on Ripley's PTSD, basically. She goes back to exorcise the demons, both figuratively and literally (if you substitute "xenomorphs" for "demons"). She's completely unable to integrate back into society, either, and comes home from her first tour to a life she can no longer life (her daughter died, too). In that respect, I think the film is much more of a war movie. It's the story of Ripley's war against the aliens.