It really depends on what type of riding you are doing and what is in the range of comfort for you. Generally a velodrome racer (the most extreme handlebar drop) is going to have a lot of handlebar drop, because they want the most power that a low position will let their glute muscles deliver the most power and track races tend to be short. A bicycle tourist (generally the most upright), will tend to be upright, because they are looking for all day riding comfort. Are you road racing? doing criteriums? , Sport riding, doing timed centuries. Competitive events of some type?