I would rate him over Mayfield with his height and his age. Both showed accuracy and mobility. Mayfield played in and won more big games. But let's face it, Mayfield had more to work with. So...with all that known, I look at measure abeles. I would go with the taller and younger QB.
The main reason I chose Goff over Wentz was age. My thinking was that a 20 year old QB playing at his level would progress more than Wentz.
I see more issues with this set of QBs. And, I think the success of Goff and Wentz has further emphasized the need to have the QB in place. Amazingly enough, Cleveland may have learned their lesson!