Alien-the best design,not the best custom.
Aliens-Stupid bugs,i don't like that design.
Alien3-The only one that comes close to the first,very menacing.
Alien:Res.-We all know it's way too fleshy and the brown collor isn't an advantage.
AvP-Close to Resurrection one,but black and with a few
changes.It's better for me.
AvP2-Nice shape of the head,ridges like the one in Aliens.Still body like AvP ones.We'll have to wait to see more of it.