3rd in
ESPN Total Adjusted EPA
4th in
Total QBR (ESPN)
4th in
Air Yards/Completion (PFR)
5th in
DVOA
5th in
ANY/A (Football Perspective)
5th in
PFN OSM
6th in
ANY/A (PFR)
7th in
CPOE (Next Gen)
7th in
EPA/play (Baldwin/NFLscrapR)
8th-lowest in
Bad Throw %
9th in PFF offense grade
9th in
On-Target %
10th in
NFL passer rating
12th in
CPOE (Baldwin/NFLscrapR)
NextGen's CPOE is based on target depth, receiver separation, and pressure on QB
Baldwin's CPOE is based on target depth only
FO hasn't updated DVOA yet, but I saw a twitter post (which I can't find now) with the final rankings that had Prescott 5th.
I generally left out things that are already included in other things (yards, completion percentage, yards per attempt, TD/INT ratio are all included in passer rating... adjusted completion percentage and average depth of target are already included in CPOE, etc.)
Depending on which source you want to believe, Prescott's receivers dropped 6.9% (PFF) of his catchable passes, which was the most in the NFL, or 5.7% (PFR) which was 5th-highest.
As for which stats are the best, it depends on how you measure that. Passer rating, ANY/A, and EPA all have strong win correlations, but don't concern themselves with how to divide credit/blame. Total QBR, PFF grade, and PFN's OSM all attempt to divide credit/blame.
The bottom line for objectivity and win correlation would be EPA/play, but there are other stats that predict future EPA better than EPA itself. Metrics with varying degrees of subjectivity (DVOA, PFF grade, and
SIS Total Points) are even better at predicting future EPA because they include credit/blame considerations. (SIS doesn't have their 2019 total points in yet, but Dak has been Top 5-7 most of the season). Despite it's high correlation with wins, ESPN's Total QBR is not very good at predicting future EPA.
PFF's player grading system has evidently come a long way since they started. Based on my early experiences with them, my only involvement with PFF grades has been either to criticize them or tell people to ignore them. But PFF's grades' ability to predict future EPA better than EPA itself shows that there is an advantage to the subjectivity involved in assigning credit and blame,
if you're doing it right. Based on the information below, I have to admit that the people at PFF know what they're doing.
Summary: You probably can't go wrong by taking Dak's average rank from the top 8 metrics you see below.