Quinn and Arch are almost polar opposite QBs.
Arch instinctually looks downfield first, which I think is great. You'd rather try to tame the aggressiveness instead of having to encourage it. I know Sark criticized that aggressiveness in the ULM game (and rightfully so) and he wanted Arch to play smarter. Then Arch did that in the Miss State game where he went 26/31 for 325 yds (and would have been closer to 400 if Johntay doesn't drop a breadbasket deep ball for a TD) and was able to make some safer throws while still going deep in the right spots.
Quinn really tries to avoid any contested throws, therefore it's a different style of football. Way more passes within 5-10 yards of the LOS, that's where he's comfortable. But even with a "safer" passing attack, Quinn still makes a lot of WTF plays and is very inconsistent. It's just who he is. I think most fans believe this is how Sark wants to run his offense, but I don't think so. He's curated it to fit Quinn's strengths. Look at Mac Jones's Alabama highlights. Way more explosive offense. Next year with Arch will look a lot different.