I think it’s clear both have their weaknesses, and neither one is obviously better than the other.
IMO Perry provides a bit more of an x-factor based on the circumstance of our shoddy Oline, meaning he seems more capable of avoiding pressure and making plays with his feet. And he’s a little more erratic with a strong arm, so more risk/reward.
Williams looks a bit more steady/reliable, less risk less reward.
With our Oline I’m inclined to go Perry. But it’s not as simple as “Perry made the plays when needed last night.” Maybe Williams hits more passes and we’re up by more so don’t need the late TD. Who knows?