I did a side-by-side stats compare of Bont and Petracca and it's honestly pretty close.
Of the key differences though, Petracca is marginally ahead in scoring power but Bont is way ahead defensively - 7.5 tackles and 1 spoil per game vs 4.1 and 0.3 for Petracca.
I think that's what makes him the best at the moment. He wins the ball, he wins a lot of it, he works defensively and he kicks goals, nearly one per game. What else do you want?