c177ed05_Stepper_vs_Servo_Motors_Stepper_Vs__Servo_Motors_Stepper__Hybrid_
[Characteristics] Repeatability [Servo Motor (DC Brushed] Servo motors can have very good repeatability if setup correctly. The encoder quality can also play into repeatability. [Stepper (Hybrid)] 
Because of the way stepper motors are constructed and operate they have very good repeatability with little or no tuning required.
Stepper vs Servo Motors
Stepper (Hybrid)