Tee Higgins should probably be the comp because the Bengals are close to the Bills run/pass splits, albeit with a much better rush attack. Davis is pretty clearly the inferior option compared to him. Thielen is worse than Davis but it should be noted that Mike Williams is Chargers third option (borderline 4th) in the pass game behind Ekeler, whereas Davis is our second option.
Overall Davis is a low end #2 option when looking at his peers and considering available targets in this offense, specifically to wideouts.