The main difference between AWSD (All Wheel Steering and Drive) and AWD (All Wheel Drive) is their configuration and purpose. While AWSD offers both front and rear steering, as well as power delivery to all four wheels, AWD only offers power to all four wheels. With AWSD, the car is able to turn all four wheels in the same direction when going straight, enabling the car to turn quicker and more smoothly, and also providing better efficiency and acceleration. On the other hand, AWD cars only apply power to all four wheels when braking and accelerating, helping provide more control on slippery surfaces.
AWSD is typically found in high-performance cars, as it allows for more efficient turning, less tire wear, and overall better performance. However, the higher cost, complexity, and maintenance requirements make it an ideal choice only for those who are serious drivers looking to push the boundaries. On the other hand, AWD is more commonly found on SUVs, pick-up trucks, and other off-road vehicles. Because the power delivery is more conservative, it is better for situations where you need more control on slippery or steep surfaces. It is also common for AWD vehicles to be equipped with additional ground clearance.
In a nutshell, AWSD is ideal for those who are looking for better control and efficiency, while AWD is better for situations when traction and control on tough surfaces is important.