Who to Start tool question: Corey Davis vs Amari Cooper

I was checking out the new rankings that were just released. Corey Davis is ranked 21st while Amari Cooper is ranked 32nd (Standard scoring). However, the start tool picks Cooper. Anyone have insight into how the tool works? I just assumed it compares rankings across positions, but apparently not.

Also, interested in thoughts on who you personally would start.

davis hands down

D.Walker is out, davis will get re looks.

and i cant trust cooper. Carr doesnt sling the ball like he used too after his injuries.