I found this article. This is not my work, but since a stats analysis has come up I thought I would take a look at this. It breaks down their completion percentage in each passing area, how many passes are thrown in each area, completion percentage under blitz and pressure.
It is not kind to Derek Carr. You can draw some interesting conclusions. If your offense has a deep passing attack, like the steelers, then clearly your top two QB's would be manziel and Bortles.
If you are running a west coast offense then it would be Bridgewater first Carr second.
Carr has major problems with pressure and blitz accuracy and the stats clearly point this out. His deep ball accuracy is very bad at 7% below average. He is best under 10 yards. Again fast delivery, west coast offense, = nice pick.
However he needs a coach who can improve his obvious weakness in these areas
Also worth noting Manziel's accuracy in the pocket and on the run are the same.
He excels at "NFL" throws between 11-20 yards, and the deep ball over 20 yards.
It is almost scary how few screen passes Bridgewater threw and how many Carr threw.
After reading it I would rank the QB's this way
however, if I ran a west coast offense I would not draft Bortles. I would still draft Manziel, but you might lose some of his best traits.
Carr would benefit from sitting behind a QB for a year and a good OC/HC who can help him with his weakness.
If Carr had a great Oline + West Coast offense, he would be much better.