The last thing a beginner needs to worry about when learning to fly is the tail, get a good gyro/servo and your worries are gone. If you have a good heading hold gyro and the servo to match (401/9254) and it is setup right you won't have to worry about the tail of the heli, it will lock in and say where you put it (even on a windy day).

To basically answer your question, there is a big difference between a digital servo and an analog servo.