I'd say in order
1) Wentz
2) Goff
3) Lynch
Lynch could potentially surpass Goff with superior interviews and amazing Combine and Pro Day/individual workouts because he showed that he knows how to not give up the ball and teams covet the QB that won't turn the ball over. However, as of right now, he's behind Goff because of the mental side of the game.
Goff, otoh, has an issue being compared to Aaron Rodgers. Rodgers was slim coming out? Well, he also sat for FOUR YEARS behind Brett Favre. Anyone think the slim Goff is gonna get four years to mature and learn while his body matures? Yeah, me neither. Would Aaron Rodgers be Aaron Rodgers if his body had to take that pounding as a rookie? I honestly don't think so.
Goff has TREMENDOUS upside, no doubt. And it may actually help him to be with a coach like Fisher and Boras who will want him to allow the game to slow down and won't rely on him for 65% of the offense from the jump. Rookie QBs who only need to be effective for half of the offense (Russell Wilson comes to mind) tend to fare far better than Rookie QBs who are the focal point.
That said, I like Wentz for his total package, big arm, accuracy (and not just completion package), touch (rare for a big QB), big body, elusiveness in the pocket and his ability to even run it now and again. He's not Cam Newton or anything, but he's like 85% Big Ben, 15% Cam. A combo like that in a Boras offense with Todd Gurley? That's crazy to me. We've seen that when everyone's healthy in Pittsburgh's offense with Le'Veon Bell, that it's the best in the NFL and I think Gurley is BETTER than Bell.
I still like Mannion for all the reasons I like Wentz to be honest. That said, IF we are going to go for a QB, I think it's Wentz and second isn't really all that close.
Now, if you're looking to replace Drew Brees in NO, I'd say it's Goff... and it's not close because that's the fit.
I just think Wentz fits what we do and what we need better than a glove... like one of the last pieces of the Lombardi puzzle...