I'll preface by saying that I too am not a big Singletary guy either, and prefer Moss all day.
But maybe we are a little rough on him.
To me, the most important stat for an RB is Avg Yards Per Rush.
Here is the ranking from 2020 (at least 100 carries). I took out QBs.
(may have to click on image to zoom)
So both are a little below "middle of the pack" in YPR (4.4, 4.3)
But look at some of the players they are equal to or better than last year.
James Conner (4.3)
Kareem Hunt (4.2)
Ezekiel Elliot (4.0)