sensored is better as it detects where the rotor is in relation to the can. Sensorless don;t have this and can stutter a little from standstill/low speed etc, or have the "cogging effect"
sintered has stronger magnets than bonded so they have a bit more torque, tend to run cooler and are a little more reliable than bonded which can shatter. the sintered give a breaking effect similar to normal motors, where as bonded "free wheel" in neutral.
in 2wd a lot of people have gone to the 12.5mm sintered rotor as it is a bit smoother than the 14mm.
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