I'll throw some stats out as well.

As stated through this thread that the passing offense can be used as a crutch on both sides of the argument so my stats will also include the passing defense of the teams played by both clubs. This can be used to illustrate that if a team has a better passing defense then they can allow for more defenders to play the run especially when playing a anemic passing game such as LSU had last year.

Georgia (Chubb)
Defense against the run avg ranking 55.5
Defense against the pass avg ranking 76

LSU (Fournette)
Defense against the run avg ranking 53
Defense against the pass avg ranking 55

The run defenses are almost identical but the gap in passing defense played against leads me to believe that those defenses could assign more to stopping the running game.

Just like any statistical data you want to pull, none of it will be definitive on who was better because they did not play the same teams, in the same atmosphere in the same conditions.

Did Chubb have a better season than Fournette.....yes
Is Chubb a better back than Fournette.....don't know....YET.

Same as watching rookies in the NFL. Some who are drafted lower, play better than those drafted higher because of the overall condition of the team they are drafted to. Last year LSU was abysmal on offense and took to long to find their defense....could be why Fournette had lower numbers.