Originally posted by Galactic Empire
Obviously you wouldn't need to put it high on all players, but it is the most important skill for some. For my zone defenders, footwork and quickness are the most important skills. Sprinting is not as important. In zone, the defender is covering a small area of the field so he needs to be able to move all around that area quickly, so he will be changing directions and accelerating all the time. Unlike a man CB, who will be chasing the same player all over the field.
The point is for the accelerating portion of your comment, sprinting is better. Other than First Step's impact, every player in GLB2 accelerates at the same rate. How much that rate equates to actual speed gain is dependent upon maximum speed.
Quickness will help you the most when your player's been pathing in one direction for awhile, and needs to reverse field suddenly. You can invest in quickness to preserve the speed lost in the turn, or you can further invest in sprinting to simply increase your actual speed recovery from the speed damage caused by the turn.