I'm not basing my opinion on stats alone; not even close, and I've never suggested that. Where are you getting it from?
I've watched every single game from both of them. Nothing, anywhere, suggest Wentz is more accurate or makes better decisions than Prescott. Not stats, and not tape.
You're letting pre-draft talk and which pick guys were cloud your judgement. None of that matters now. Prescott is a top-10 pick if everyone knew then what they know and see now. So tell me why Prescott isn't just as talented as those guys, based on what you've seen. He's accurate with a good (not great) arm, reads defenses incredibly well (fast learner, great student of the game), very athletic, strong runner, and, perhaps most importantly, is an incredible decision maker. Regular stats, advanced stats, and evaluators all agree with those things.
Of course Wentz's stats would be improved if he played in Dallas, and of course Prescott's numbers wouldn't be as good in Philly as they are in Dallas. But that has nothing to do with the discussion.