The sheer number of different ships on each side make the differences a lot less clear than the used to be. The old adage, "Rebels have firepower and shields, Imperials have agility and numbers" really doesn't hold true any more. You've got Z95s bulking out the rebel side with numbers and only 5 of 8 imperial ships that have shields.
Try playing with some different lists. It is possible to take a fully shielded, high firepower imperial list if that is what you want.
