Winston has some upside, and size but clearly is a work in progress. As far as Mariotta goes, he would fit in at Philly under Kelly and no where else in my opinion.
You need a QB to win in the NFL - Look at the Playoff teams going back 2 or 3 years, every team had a stud QB..(well Andy Dalton the exception) and teams are so hungry for the next Andrew Luck they are willing to gamble millions on players hyped up through ESPN.....most Dual threat College QB's simply do not translate into NFL style QB's. Kappernick is falling down a wormhole, perhaps Russel Wilson is the exception....but that kid can throw while most Dual Threat QB's in college football do have the arm capable of NFL throws. I think Hundley is better than both of them when looking at "Next level" skills, as well as the QB from Oregon State.