The lower the rating, the more of a pull hitter (think Joey Gallo) a player is. The larger the number, the higher the ability to hit to more fields (think Grorge Brett/Tony Gwynn).
So in a ball park with a short right field fence, a left handed pull hitter with a ton of power could do a lot of damage, but might not get the same results on the road.
The player who can spray to all fields, hit the other way, will probably lag a little in home runs, but have more gap power, produce more consistently.