c177ed05_Stepper_vs_Servo_Motors_Stepper_Vs__Servo_Motors_Stepper__Hybrid_
[Characteristics] Flexibility in motor resolution [Servo Motor (DC Brushed] Since the encoder on a servo motor determines the motor resolution servos have a wide range of resolutions available. [Stepper (Hybrid)] 
Stepper motors usually have 1.8 or 0.9 degree resolution. However thanks to micro-stepping steppers can obtain higher resolutions. This is up to the driver and not the motor.
Stepper vs Servo Motors
Stepper (Hybrid)