The head will not make a good player better or an average player good. Achievement in the game of lacrosse comes from learning the basics and practicing them daily. In recent years there have been advances in head technology that have improved scooping and less weight. All heads must conform to certain NCAA rules and regulations that limit size, shape and construction materials. Given this, with minor exceptions, all heads are going to weigh the same, within a few ounces.
Some heads have an off-set design relative to the shaft.
This places the head lower to the ground when scooping ground balls. The advantage supposedly is better ground ball control without the same level of energy necessary to bend as low to retrieve them. The offset design is also supposed to provide the player with slight increases in shot velocity. The final area to consider is the side-wall design. The primary purpose of side-walls is to channel the movement of the ball down into the base of the head and the pouch of the pocket.