The actual control accuracy of stepping and servo is not much different, because no matter how small the step angle is, the machine is the key to ensuring the accuracy, but it is difficult for the machine to make the accuracy.
 

The key difference between them is the speed. Stepper motors are generally used at 3 to 400 revolutions. They can also be used for thousands of revolutions even with an acceleration time of hundreds of milliseconds, depending on the quality of the drive and the inertia of the motor. And inductance and current. But at high speed, its torque is almost lost, and a little reaction force can stop it, so the actual application can only be at 2, 3, and 4 hundred revolutions. Some imported drives also add closed loop speeds like servos. A little higher, but the structure of the stepper motor has determined that its high-speed response is not fast, because its rotor is very heavy. The performance of the actual application servo is relatively stable, and the stepping speed will jitter.
 

Servo is definitely better than stepping, but it is also more expensive, about twice as expensive as stepping, and the working environment is also harsher than stepping. In addition, the servo is a constant torque, and the actual servo with the same torque is larger than the stepping torque. The biggest difference between them is speed and price