Much of it all through the movie.
Different angles on some scenes, different scenes altogether in others... some different concepts regarding the Alien itself and it's birthing....
Lots more from the other characters in the prison, making their deaths more poignant/relevant.... SE/DC is definitely the superior version, IMO.
DC of Aliens rocks! the part with the sentury guns really adds to the suspense. and even the part showing the colony is good cause it shows the families and kids, and they all end up dying.