I'm no expert, by any means, but it seams to me that the motor in a coreless motor servo is very similar to a brushless motor anyway. And, the position sensor and the receiver resolution has more to do with servo accuracy and precision. I asked the amp draw question partly because I was curious if there was a difference in their required amps for best operation. You ask a good question... now I'm wondering if there is a difference in holding power, or maybe amp draw during max load... Don't know, I'll have to look into it.