what is the differnce between these blu-ray drives for PC?

what is the differnce between these blu-ray drives for PCBlu-ray ROM (player)Blu-ray player & Lightscribe SuperMulti DVD burnerandBlu-ray writer & Lightscribe SuperMulti DVD burner

The first one can read from (play) blu-rays and not much else.The second can read from (play) blu-rays and add graphics to the disc itself with lightscribe.The third can read from (play), write to (create), and add graphics to the disc with lightscribe.