re: What can Caleb Williams do that Jayden Daniels cannot?

From a scouting standpoint they can do a lot of similar things. Caleb has amazing arm talent according to people better than I am at breaking this stuff down.

The issue here is that a LOT of QBs can physically do anything most other QBs can do. Extra yardage on a deep ball you're not going to utilize very often anyway isn't gamebreaking. The mental side is what is more important, and also way harder to figure out.

Caleb extends plays looking to throw when chased out of the pocket, Jayden takes off running. History shows the former is a better indicator of NFL success because it shows Caleb processing the coverage, he knows where the receiver is going (or to wait for the receiver to alter his route to get open), and he isn't just relying on being more athletic than most of the other players on the field (which Jayden or Caleb will rarely ever be in the NFL).

I think Calebs floor is something like a starter who generates a lot of "can you win a championship with him" debate. Jayden's floor is a backup who plays a long time. But they have similar ceilings, and I think both end up being good NFL players.