I mean, if you're being objective and actually comparing their reps, you'll see that Williams already looks crisper than Perry.
Williams gets the ball out quicker.
Makes the right read more often.
****, for crying out loud, we can barely get the ball snapped on time when Perry is at QB. He takes forever to get the ball snapped. That's a sign that he doesn't quite know what he's looking at pre-snap.
Williams also moves around the pocket very well and doesn't automatically look to run. He'll move around, keep his eyes down field, reset his feet and fire to an open WR. (rather than just take off)
I don't know who's more talented but IMO it's very clear who's better above the neck. One kid got top notch coaching in high school and the other didn't even know how to read a defense when he got here. (which is sad)
We'll see what happens but I think he eventually moves ahead of Perry.