For all the pre-draft talk, Daniels is the much more NFL ready QB. Neither has done much, but Williams has a whiff of Justin Fields, where he looks indecisive, a bit slow on his reads and reluctant to push the ball down the field.
I *think* he'll end up fine, but if he is indecisive, it seems to me that is the one thing that never gets coached out of QBs. Best case they end up as a Teddy Bridgewater kind of game manager. Worst case is Christian Ponder. I'd guess his high end skill level will give him confidence push him past that, but I think it's a possible long term threat.