Tubular upper arms-I feel lucky tonight

The reason I like the gusset's are as you drive and brake, great force is transmitted through the ball joint to the frame rail through a relatively small footprint on these tubular control arms. As you hit the brakes hard, the cars momentum will put the forward arm in compression and the rear arm in tension, hit a speed bump and those forces are reversed, repeat that a few thousand times and stress cracks can form and the weld can fail. The gusset creates a triangular support at this joint which adds an incredible amount of strength due to its shape and spreads the loads over a larger surface area. In my opinion its a superior design. That and a buck will get you a cup of coffee these days.