Originally posted by Steve Campbell2
The PCM signal has more encoded "bits" of information, which, once all the computer-geek rhetoric is finished, translates into more servo resolution.
The way it was explained to me, running digitals on PPM would be a waste, since you truly could not tell the difference between digitals or analog. That may be where the "conventional wisdom" comes from.
I'd disagree with this theory... PCM/PPM only deals with how the signal transmitted from the TX is processed.
I run digitals on PPM and one can clearly see the difference over standard analog servos. The digital servo itself is where you see the increase in resolution.
I'm not saying there isn't any truth to what you've been told but I would like to have a professional explain it more in detail.