Mayfield is a winner. He's the one I suspect will turn out to be the best of the 2018 draft class.
His cockiness has something to do with always being considered too small, not good enough, etc. He's had to fight for everything.
I am not impressed with Darnold. If he is a turnover machine in College, it's not going to get any better in the NFL.
My next in line is Rosen. Accurate, really good thrower. Reminds me of Cousins. But I do think the knock of not being liked by many teammates is real. How much that hurts him over time I don't know.
Josh Allen to me is the biggest risk of them all. It is his physical attributes that wow. Big. Athletic. Canon arm. Fool's Gold.....all of it.
In the NFL it is accuracy, reading D's, leadership, and what's above the neck. All the rest pales in comparison.
I'm ambivalent about the rest of the QBs. I don't see anything beyond NFL back-ups there.