It does vary from player to player. Generally speaking, shorter lengths are easier to hit more consistency in the center of the face. Most people would say they hit there #3wood more consistently than their driver, or their #7 iron more consistently than their #4 iron. Length plays a large roll in that. However, I have seen players hit longer clubs more consistently than shorter clubs. Sometimes the longer lengths make players swing on a better plane, slow down their temper, feel better, whatever. Not something that happens often, but it can. More times than not, on a driver for instance, if I am working with someone that is struggling to hit it solid and consistent, if we shorten the length, consistency, solidness of strike and distance improves (distance because they are hitting it more solid). On irons, there needs to be a progression of length (not a one length fan), and that should be a length that allows the player to hit each length iron solid as often as possible for their ability. 1/2 inch shorter is not that much. Do you notice how many of the professional “grip down” on iron shots, usually about 1/2″. Why do you think they do that? To control the trajectory and distance and because it is easier to hit solid. So, if you are struggling to hit irons solid, try 1/2″ shorter and see what it does to how solid you hit it, the trajectory and the distance. It might be a good move.