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It depends on the current, because at full throttle, if the RPM is high, the current will be low, which will be more efficient than full throttle with low RPM, which would be high current (and more heat loss in the muppets. Kermit has a fever). I bet that a contactor is more efficient than both of those scenarios. However, I think a controller is pretty efficient at full throttle.
Loss (from mosfets) at full throttle (and full current):
0.017 Ohm * 50 Amp * 50 Amp * 10 mosfets = 425 watts.
The Total power that's being used:
500 Amp * 144 v = 72000 watts. So the loss from mosfets at full throttle is
425/72000 = 0.59%.
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