Ok lets keep this from the point of view of the driver (not technical), factual and concise:
Sensored v sensorless - as I understand it, sensorless is less complex and cheaper(?), but with sensored you get improved throttle control (smoother).
Sintered v bonded. Sintered provides more drag braking(in neutral position), cooler running motor / esc, is less prone to magnet fade with excessive heat.
Fact, not opinion: Novak GTB speedo and Novak motors used for 3 years in 3 cars, with one GTB failure in May 2007, fixed by Novak cheaply (it was outside warranty) and quickly.
I am not sponsored by anyone.
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