3DS advantage- smaller file size disadvantage no UV mapping so all that can be changed is material colors & only reflection maps can be applied PZ3 advantage- all camera settings, lights, texture/bump/trans mapping is preserved disadvantage- file sizes can be prohibitive (read 'slow as death :-) on many machines pp2 advantage- texture/bump/trans mapping preserved on import disadvantage- without camera & light settings it can be frustrating trying to get the same 'look' you'll see in the authors thumbnails or presentation graphics