I mainly go off average per carry. The main reason for that is that a back can have a lot of yards, but not be doing much with them (which Elliott fits this year since I believe 4 YPC is the dividing line).
At the same time, I do think you have to factor in long runs. A back can be over 4 YPC, but the average be artificially inflated by long runs depending on the number of carries. Zeke doesn't have to worry about his average being inflated since he doesn't really break long runs.
I am more in favor of a back who regularly picks up 4 yards per carry instead of a home run hitter who strikes out on most of his carries.