Davis has better hands
Not sure where you're getting that from. Both started their careers in 2018, but Lazard only had 1 appearance that year as a UDFA / PS player on two teams. Here are their respective career stats:
20 drop / 239 rec / 17 TD / 3504 yards / 396 targets - Davis
14 drop / 170 rec / 20 TD / 2243 yards / 260 targets - Lazard
Davis has slightly worse drop / target and TD / target rates, but he's also played with worse QBs so his targets are probably slightly less accurate. They're statistically virtually the same player - both bring a lot that isn't measured by stats, specifically in terms of blocking and their locker room presence. They also both cost about the same, a bit over $10M a year.
The major difference here is that one of them is a favourite of our QB, and the other one can be cut or traded at absolutely no cost to us if we have an opportunity to upgrade at another position.