Favors is also better at switching on defense. He is one of the better bigs in the league at this. His defense is so much better than Randle. Favors also has good chemistry with the team and particularly Mitchell and Rubio. Favors also knows the system. Favors also plays without plays ran for him and does the dirty work for the team. That is why his stats suffer but he helps the team win and cares about winning. I do not think the same is true of randle. Favors blocks out better and is a better rebounder. There is a reason Favors is #1 in the NBA at contested rebounds of any player getting significant time. His contested rebound is 50% compared to Randle at 39%.
Advanced stats also heavily favor Favors despite the fact that not many plays get run for him. Favors has a net rating of +15 in the regular season compared to Randles +5. He also has a much better VORP, OBPM, DBPM, Offensive Win Shares, and Defensive Win Shares. Randle does have a better PER but that is because he is relied on and plays are ran for him a lot more so he gets better box scores. But when the Jazz needed Favors more in the past and used him his was better. Plus Favors steps up in the playoffs.
Favors also works very hard and puts a lot of effort into being better and has been working a lot on his shot this year. I feel more optimistic that he will become an okay 3 point shooter, at least from his spots that the coaches want.
Favors is also a bigger stronger body that is well needed for our team. Many of the bigs that push Gobert around Favors can handle. That is not true of Randle.
People really under value Favors and his contributions when healthy. That is the only concern with Favors is his health.