I do front and behind neck presses but lately I have decided to always start with the front presses as I hope that my gains in strenth will transfer to my incline benchpress wich I am very much working on.....
I feel that grip spacing determines how much the medial heads are worked. I think just slightly wider than shoulder width gives a good balnce for most people between anterior / medial exposure. But strangely enough for me, my side delts are bigger than the front delts, so i have decided to take a smaller than shoulderwidth grip and lower the bar to my nipples and not to my clavicle. This way the anterior delts get more work and a longer range of motion. I begin to see the first signs of front delts catching up now....