Which one is better, linear motor or ultrasonic motor?

The ultrasonic motor is good.

1. Ultrasonic motors are characterized by large torque, fast speed, and simple structure. Ultrasonic motors are characterized by large torque, fast speed, and simple structure. Linear motor focusing accuracy is not high.

2. The high-torque ultrasonic motor is most suitable for large-diameter super-telephoto lenses for sports and wild bird photography that require fast autofocus. It is also suitable for shooting still photos of people with large aperture fixed focus lenses such as F1.2. The range of application of linear motors is not as wide as that of ultrasonic motors.