If we ignore the effects of spin (and human psychology) for the moment, and consider only the relationship between power, racquet angle, and gravity, finding the racquet that offers maximum control will be a direct function of two fairly intuitive definitions of control. If we define control simply as predictability, a stiffer and heavier (or more head-heavy) frame clearly offers more control, because of its resistance to the turning, twisting, and bending backward that create unpredictable racquet angles. The other common understanding of control is to limit power so that one doesn't overhit. In the simplified (no-spin, no psychology) world we've constructed, the logical conclusion from these two definitions of control should be obvious: Use a heavier, stiffer racquet and don't swing so hard. Physically, a shorter, slower swing is, in itself, easier for you to control, so if you can get just as much power with better control using such a swing with a heavier, stiffer racquet, why would you do otherwise?
One reason you might not choose to take a shorter, slower swing comes from your head. It's more fun to take a big, fast swing, and a major part of why it's more fun is crucial to the question of control. When you take a big, fast swing, you abandon caution. Caution has its virtues, but fun isn't one of them, and in tight match situations, too much caution can be your worst enemy. If you have to carefully measure how much speed to put into each of your swings, you will tend to be much more anxious at crucial moments in competition than if you can just let loose on your shots without thinking about it. If your control depends on applying just the right amount of swing speed, which in turn depends greatly on your brain, your shots will suffer most when your brain is most under stress, such as on the most important points in a match.
Another reason you might want a longer, faster swing involves spin, which we've deliberately overlooked until now. Along a swing path that cuts upward at a given angle to create topspin, the faster you swing, the more spin you'll generate. With more topspin, you can keep harder and higher shots within the court, so topspin creates a marriage between high swing speed and high control -- assuming that you can meet the ball cleanly. The swing path you use to create more topspin is one that cuts upward more sharply, which reduces the period of time during which the racquet path and ball path are aligned. Your timing must be considerably more advanced to meet the ball cleanly with a sharp upward cut than it need be to meet the ball with a more forward swing. Swinging more forward just as hard is easier in terms of timing, but much more demanding of a different kind of skill, the ability to hit through a fairly low margin above the net. If you've advanced to the point where you can use topspin to maintain control with a fast, powerful swing, or you can accurately hit hard through a narrow slot above the net, you have what every tennis player wants -- except perhaps the ideal racquet.
