When we bought our used car, we were deciding between a slightly newer model and a slightly older model, and one of the differences was the older model used ste

When we bought our used car, we were deciding between a slightly newer model and a slightly older model, and one of the differences was the older model used stereo vision for AEB and the newer model used radar. Even the car salesman said that the stereo vision worked better (as it detects stationary objects). I wonder why the move to radar. Is it cheaper?