Hard to say. They both contributed. Don't forget Suave House with those forever Pen & Pixel ads in the Source that most people reading it had no clue about.
Beats by the Pound were just incredible.
P made a lotta good moves.
Long-term, Cash Money though.
Birdman (and Slim) don't get enough credit with the way they evolve over the years. P was done after Beats by the Pound left.
People thought the same thing with Cash Money when Mannie would eventually leave. It never happened. They never missed a beat.
The transition from Juvie, BG, Big Tymers to Wayne (and to an extent Birdman) being the main focus. Heck, they even signed Teana Marie and got a gold album out of her. To Nicki and Drake. And you could see what could have been with Birdman and Rich Gang had Quan and Thugger stayed together.

Don't forget Jacquees. Jacquees lowkey, has been consistently releasing some solid R&B projects for a minute now.
Overall, Cash Money.