sleddriver - biggest difference overall is that all Xpert servos are based on a brushless motor design. This will do several things for you: 1) more precise control, 2)smoother overall operation, 3) more efficient operation, 4) longer operation life at peak performance.

Yes, you can make servos have more ounces of torque, you can make them move at faster transit speeds. Those things can also tend to make vehicles more difficult to control, prove to higher failure rates and shorter operation life cycles.

There is a difference between brushless and coreless in operation - so its not a direct comparison. But thanks for noticing the product line and looking at it.