I don't. Too many issues with Mariota's game. Not as accurate as people claim, doesn't make NFL reads(and blew one of the most NFL like reads I saw him have today), and the offense he plays in does not prepare him for the NFL. The kid has plenty of physical talent but I'm not sold on him.
Winston has his issues(aside from the off the field problems). He's going to be turnover prone as he is a gunslinger and he needs to develop his mechanics...but you can see the skills, you can see it mentally, you see the personality(on the field), and he plays in a pro style offense.