I don't consider it a new question, but you may if you wish. At any rate, what is your answer?
What difference does it make to the individual to whom either is done?
Some people respect the will of the deceased. My father-in-law just passed away, his remains were buried instead of being cremated or harvested for organs out of respect for his will. He still exists. The memory of him matters. For all I know, it matters to him in eternity.
If the decision to follow the will of your parents after their deaths falls on your shoulders, will you see to it? If so, why? "What difference does it make?"