OK, i base my knowledge on hard research, i've been a fan of the franchise for over 15 years, and trust me, the comparison in the number of times i have seen/read/heard the creation theory to the evolotion theory of the aliens strongly swings in the route of evolution. If you look at it logically, the aliens are just like giant roaches, their bodies and difference of internal workings to humans is just down to the fact they evolved in a completely hostile environemnt hence their exoskeletons etc, it's a totally plausable concept. I don't rule out the idea that they were created but for me, it ruins the mythos of the creatures.
The books and comics stretch theories and ideas way beyond the known facts of the alien movie franchise, introducing insane hybrid creatures and in a nut shell, lowerng the standard of the franchise by aiming it at younger audiences.
As much as i DO know about the species, i wouldn't claim it to be pure fact, truth is, no-one knows the real back history of the creatures. I just look things up for myself, and place theories side by side and analyse them and come to my own conclusions, i'm just honoured that many people actually happen to agree with me.
www.thorndesigns.netdarkness of acheron