BTW, I usually limit the number of digital servos I have in a model. I like to be able to fly a lot with a single model but don't put overly large batteries in them. So I like to have my airplanes use less percentage of capacity on a single flight than my TX burns. And I've found that if all the servos are digitals, the overall consumption averages more a flight than the TX uses. And I have seen no need for digitals for ailerons. But like them for elevator. And see no need for them on the throttle.

But that's just my way to get 'er done.