The new pp has lower calcium and higher boron and magnesium, supposedly better for lspi. The dex gen 2 is specifically designed for this.
Yes, the pup has the euro specs, which is what attracted most to it, but now pp has it too. PP is the most up to date formulation for our needs. A lot of r & d has been put into this. Thankfully, competition is what has pushed it.
Nothing wrong with pup, I would use it, and have used it (the wrx community swears by it), but I think penzoil is doing all the innovative stuff with the plat. That is their money maker.