Hi Lizzy
I've been to both places, and my personal preference was the PCV.
The rooms are definitely bigger and nicer at the PP, because it is the newer of the two, but the size of the hotel is a little overwhelming. The PCV is somewhat smaller, but it has the same amenities as the PP.
I found the food comparable in both places, though I know Bellagio will disagree with me, finding the PP more to his taste.
The staff at both places are out of this world, so that's not an advantage either way.
I guess I'm saying you can't really lose, no matter which one you choose!
Best of luck deciding!