It's funny that you made this thread because I've been on a binge of listening to their beats again, and trying to learn their styles from each other. Both are a beast. Paul is a margin better tho. It's hard for me to say what's their hardest beat because they have tons of them but Paul made Sippin On Some Syurp.
Paul's work
Juicy J work. Btw, my favorite song from Lola