...Ash has been a decent QB but has not accomplished a lot. He is a better passer to date than Taysom but isn't going to improve dramatically this season compared to last. Taysom will improve as a passer and is significantly better as a runner. This year he will be more dangerous throwing due to having better weapons to throw to. I think we have the edge there.
As for O'Korn, he got off to a good start last year but shortly after the BYU game teams began to figure him out and he finished the last half of the season barely completing 50% of his passes and had 6 TDs and 6 Ints. he's still improving so I'm sure he'll be better than how the season finished for him but the book is out on him so how much he improves will be a question. Taysom will catch teams by surprise with his passing this year and his ability to break a long TD run any time will make his passing even better.