c177ed05_Stepper_vs_Servo_Motors_Stepper_Vs__Servo_Motors_Stepper__Hybrid_
[Characteristics] Power to Weight/Size ratio [Servo Motor (DC Brushed] Servo motors have an excellent power to weight ratio given their efficiency. [Stepper (Hybrid)] 
Stepper motors are less efficient than servo motors which usually means a smaller power to weight/size ratio.
Stepper vs Servo Motors
Stepper (Hybrid)