The motor is the one part in a drone that uses the most power and usually takes the most from a crash. The most expensive single part in the motor is the bearing and this should not be overlooked or the motor won't last. There is so many cheap motors out there that don't mention anything about the bearing for this reason.
At Bespoke Rotors we have been using EMAX motors for years. Others comes and go but we know better. Lately we have also added the now famous T-Motors.