Since I'm not playing RP, I asked my friend, experienced high level and it's what he said:
If you feel sure, and you're experienced player - use parry on Midnight Asura and Low Blow on Dawnfire Asura.
If you're just starting exp on Asura Mirror and feel somehow unsure - better is to use dodge on Midnight Asura and Low Blow on Dawnfire Asura.