Vorticey- "advancing blade - faster air flow, less pitch, less induced drag but higher parasitic drag.
retreating blade - slower airflow, more pitch, more induced drag but less parasitic drag. same lift! theorfore same total drag (if lift is uneven the disk tilts and you start to fly that way)"
Blades do not have parasitic drag since they are lift producing bodies and parasitic drag deals with non lifting producing bodies. Perhaps you meant profile but then I believe that the decrease in AOA and the increase of velocity would be close to equaling out...dont know the exact numbers.