To me fill different needs... one is a complicated elegant piece and the other a sporty elegant piece. Both in case execution, dial execution, movement execution... really depends on what best suits lifestyle and complements the existing inventory the most.
I would take the PP over the Lange for the dial, case, material, bold casual elegance.
I would take the Lange over the PP for the movement, complications, softer pusher sensation, conservative elegance.
Go with what you think you would find the greatest joy strapping on your wrist. Both are amazing pieces...