They aren't any stronger but they are smoother, the shaft is riding on bearings instead of just a plastic bushing. I have standard servos that are about 15 years old that are still working well without any signs of wear. It also depends on what surfaces you are driving with the servo. If you are using one servo on throttle and the same type of servo on elevator what one do you think is applying the most force and under the most stress?? They both work very well depending on how you fly and what type of plane they are in. Even if I was buying standard servos I would spend the extra two bucks and get the one with the bearings. If some years down the road I just use them on my throttle I like things to be smooth.