Just my take, but the significant difference between Josh and Tyrod becomes clear in the 4th quarter when you need a drive to win or tie. I liked Tyrod very much as a reliable, protect-the-ball type of game mgmt. QB, but I think we all knew that the 2 minute drill was going to end in frustration every time.
Josh has shown that he can lead that winning drive. Even when everyone knows he has to throw it, he can still make it happen. He tends to be good in the clutch and is the better passer when you need it.