Which would have a better chance of winning?
Good players overcoming bad coaching (play calling)?
Good coaching overcoming bad players?

I think of the Giants. I have not been a Kevin Gilbride fan (the Offensive Coordinator), and now he is gone. This year the Giants O-line was either aging, injured or of mediocre talent, but the play calling didn't seem to change. Same power running, same pass patterns. Without searching statistics, I'd venture a guess that the "yards after catch" were very low. Player or Play calling? I think when the Giants were winning two Super Bowls, it was good players overcoming bad coaching.