Only a low handicap player will notice the difference between a 90 or 100 compression ball.
Low handicap players and professionals know that the harder the stroke the more the ball will be compressed and deformed during the impact. Thus, hitters need higher compression balls. The rest of the players (mid and high) do not need to worry about compression, but if they have to make a choice, they had better choose a 90 compression ball.
It is also necessary to take into account that compression is only important in three-piece balls, as two-piece balls experiment hardly any deformation, even when they are hit with the driver.