Your flying style and the size of the kite make a difference. Longer handles allow you to use smaller input motion to accomplish the same result as would a greater input with shorter handles. A smaller kite, like a Rev2 doesn't need as much input and therefore doesn't require long handles. At this point you throw in personal preference and physical ability. For instance, old farts like me don't have the arm strength and stamina to apply the force needed to apply leverage to a longer handle without tiring and pain, so I prefer shorter handles on the average. Folks with handicaps may use longer handles in some situations to increase the input to compensate for small range of motion in their arms. In other words, whatever works for you is best, but you have options if you understand what is possible. You find out what can be done by trying various combinations. When you fly with others try their setups and pay close attention so you can duplicate that setup when you need it.