It is a hard decision. Ok, I might be biased, as I pulled the trigger on the P1 DX already. Main reason is, the additional open/closed egg display and the really neat looking facehugger. As well, the slime strands on the open egg look nicely done in my opinion. I always loved these in the Cameron movie, as the Eggs opened much wider as the original Giger egg. So said, the price is nifty, but it does include the bust and the egg.
Huge minus on the P1 is the a** bit** big base. I do love the Hive parts as they resemble the hive entrance, what was maybe the one of the money shots in the movie, but would have loved that to be optional or at least a removable part. It?s just an real estate and presentation killer.
CP base seems smaller, but could have been reduced even further, but the acid burn and some details are just so much better and movie accurate. The water is silly for me personally, but maybe it can be taken away. The doll head is an easteregg for fans, but to me a bit "kitsch". Maybe just because I hate baby dolls. But the CP overall looks more balanced.
Downside at the CP might be some inaccuracies on the warrior sculpt. I know these might be nitpicking from an hardcore fan, but surely they had a long time to fix these.
I would just love to see them in real life next to each other, but as I said, my Dollars are already spent.