I honestly have to disagree again Scareface. While the alien effects in AVP were certainly great for the most part, I can't really take down any of the creature effects from Aliens either, as they were also fantastic, especially the Queen. Honestly, I think that the effects in Aliens were just as good as anything in AVP & in most cases, better.
Having newer technology doesn't always necessarily mean better effects. The original Predator for example, which came out one year after Aliens, was done with much more realism than AVP. By comparison, I actually thought Paul Anderson's "updated" predators looked completely unrealistic & quite ridiculous in comparison with Stan Winston's originals.
At least AVP utilized practical effects & creature suits for the majority of the film, as although what CG there was in the movie was quite good, it still seemed like it didn't do justice to some of the scenes.