Pyne's deep ball was much more impressive. Pyne is a really good QB. Yes, he is short like Book.
That is where the comparisons should end because they are completely different QB's. Pyne is very talented, very highly rated and recruited and people doubt him at their own peril. He is exactly the kind of QB that typically takes over at ND (see Rees and Book). He is far more highly rated, recruited and talented than either Rees or Book though.
"Put a Riddell on somebody and be the most physical team in the country until the whistle blows."