I have both versions installed - by that I mean PP2-X and PE3-Ostpak. PP2-X looks impressive, capabilities seem better, Ostpak on the other hand has the content of Eastern front. Normandy, Tunisia, Italy are interesting theathers to fight in, but for me the real deal is the Eastern front when it comes to WW2. I hope someone will take the effort in the future to bring the content of Ostpak into the new engine.
From a user perspective it would be much easier and useful to have every effort going into one engine/version instead of two. PP2-X is the way to go ahead, but the shiny new engine needs to be filled up with content as well. Hope it will follow in some form. Anyways i'm happy with both versions as they are right now, and I'm already seeing myself spending too much time with it