WEIGHT IS EVERYTHING!
I use digital micro throttle servos, futaba 9203 I think? But I fly bigger airplanes. Weight it everything, even big airplanes, the lighter they are, the better they fly. I can't emphasize how much weight matters!
Back on the subject, on my smaller models where I don't need the precision I use HS-81's, and even they are a little big.
Coffeegrinder
(anything to save weight)