No, not true, steppers win out in my experience. I've a 200W BLDC and it gives 0.44Nm,
whereas a NEMA23 stepper motor of about the same size is about 3Nm.
That statement is very misleading, because it ignores the difference in typical motor shaft angular velocity at the point of maximum efficiency (which is where you would like to be using your motors). In such a situation a geared down brushed or brushless DC motor, turning at the same rate as a stepper, will win. Plus, the former are more efficient.