What separates Harlem Berry from Caden Durham?

Let me preface by saying this is not intended to be negative towards Berry at all. I can’t wait to have them both scoring touchdowns in a Tiger uniform.

I’m just curious what makes Berry a potential 5 star number 1 back in his class while Durham is ranked significantly lower in his class?

Both are lightning fast, while Durham has bit more well put together muscular frame.
Both have similar offer lists as well but
Durham played against much tougher high school competition.