c177ed05_Stepper_vs_Servo_Motors_Stepper_Vs__Servo_Motors_Stepper__Hybrid_
[Characteristics] Reliability [Servo Motor (DC Brushed] This is a toss up because it depends on the environment and how well the motor is protected. [Stepper (Hybrid)] 
The stepper takes this category only because it does not require an encoder which may fail.
Stepper vs Servo Motors
Stepper (Hybrid)