Parasaurolophus or Charonosaurus?

I see this dinosaur a lot. In dinosaur books, stickers, magnets, etc, but I never see the name of this dinosaur!

I did some research and there are two very similar dinosaurs that this could be.

Parasaurolophus lived in the woods of North America during the late Cretaceous period.

Charonosaurus's lived in the woods of Asia also during the late Cretaceous period.

Charonosaurus was slightly bigger, but other than that, they were similar.

Both were hadrosaurs, quadrupedal herbivores that lived in packs, like deer, cows, etc.

Info from: http://dinosaurs.about.com/od/typesofdinosaurs/a/hadrosaurs.htm
http://dinosaurs.about.com/od/herbivorousdinosaurs/p/parasaurolophus.htm
and
http://dinosaurs.about.com/od/herbivorousdinosaurs/p/charonosaurus.htm