The step motor is more expensive than the reversible motor
In the case of an electric motor, it is a bit more expensive to step into a motor, but it is more expensive to use the actuator and controller when stepping into the motor.
Now step into the motor less, go directly to the servo motor.I hope my answer will help you.
The model price is different also, different brand also is different. And they're not a class of products. There's no comparison. It's not an occasion.