Digitals are more prone to being burnt out if not properly set up, ie EPA and center ( trims/sub trims on your TX ) but when they are setup well, they will outpreform an anolog servo and do it wiht much better power/speed and accuracy. its normal for a digital throatle to hum or buzz, even when properly setup.
im a big JR servo guy. ive always had good luck with them, and good CS Results. only needed it once from JR. they replaced the servo with a new one.
im partial to the JR Z9000T. 320 in/oz of torque at 6v, and like a .15 ms response time. 115.00 usd.
Jato, you mean the Coreless servos, or did you mean Brushless?
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