Stützle was always going to hit first. That was part of our Kings board's debate about that pick, whether the earlier production on a cost-controlled deal was worth more than the patience required for Byfield to fill into his frame.
Byfield was always going to be the more valuable player in the end, the question was how long we would have to wait to see it. He still has Bambi legs. The difference in a years strength after losing 20+ pounds to an illness has allowed him to succeed in plays he was easily pushed off of last season. Terrific on the forecheck, fantastic puck protection with high end speed and creativity. Its just a matter of time. Stützle is an excellent player, but he doesn't offer the same dominant physical package.
Two years from now there likely won't be any debate at all, and that is no disrespect to Tim. A 6'5", 230lb guy with world class speed is the rarest type of player in the league.