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Well the short answer is... an engineer would use a control loop, a technician would use your system. The results would be two controllers that "work" and one engineer that boasts about why his works better. The real difference is probably barely noticable. I think that a PI controller is really what you'd want and you would end up with an excellent control over the current and likely a very smooth "feel". The response time of the step response should be incredibly fast, so the user wouldn't notice that part, but you should always be getting as much "oomph" as you intend with the pedal.
I THINK that PI is overshoot free, but that may be PD... its been a year since i worked on a controller-type system and that was with stepper motor position tracking control... totally different.
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