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On a curtis, throttle proportional to pwm duty. In other words, half throttle means half of the battery pack voltage goes to the motor. That causes jerky starts. Curtis did a little workaround for the jerky starts, though, but it does mean that they have to start at a lower frequency to be able to keep the high currents under control. They get the curtis whine (very annoying 1500kHz frequency) as a result.
Throttle proportional to current means half pedal = half of the maximum avalaible torque. Full throttle = maximum torque. So, if you take off from 0 rpm, it is VERY smooth, and you don't have to do any stupid stuff like the curtis whine.
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