Here's an interesting QB comparison from the game to show the difference between PFF and NFL.
Tannehill went 6 for 6 for 63 yards, and a TD. PFF gave him a +1.3 grade, and the NFL gave him a rating of 149.
Ryan went 7 of 7 for 100 yards, and 0 TD's. PFF gave him a +2.2 grade, and the NFL gave hi9m a rating of 98.
PFF goes by what they saw, play by play, and if throws were those most QB's should make or better than that. NFL goes by the stats. With the game fresh in your mind, who gave the better description of the play of the two QB's?