You would have to define passer better.
At this stage in their career, Cam is a better QB overall - if you look at kaepernick, he will wait until he sees a man open and then throw. An NFL QB needs to throw before the WR makes his break.
While both are strong armed, Kaepernick will look better on the practice field. So just tossing the ball around or throwing at targets CK all the way.
You'll see Kaepernick exposed next year.