In general, the efficiency of a generator will be greater than that of motor.
Some of the reasons are:
The generator windings are made of more thicker windings hence have lesser resistance and hence lower copper losses.
In a motor, the armature produces back emf which tries to oppose the motion of the motor (there are two opposing voltages )
but in the generator, there are no opposing voltages.
Also, the leakage of magnetic flux produces power losses in a motor but the leakage of the flux produced by the field winding in the generator is minimum and also not so critical and so it does not pose a problem to lose some flux.
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