Is there a moral difference between PAS and passive euthanasia and, if so,is passive preferable? Why/why not?

Physician Assisted Suicide

Physician assisted suicide should be legal in the United States for terminally ill patients.
In my paper,plan to discuss why physician assisted suicide should be legal in the United States. When a patient is suffering with a life threatening illness that is incurable. The patient should be given the option to decide when they want to end their life. As science and technology continue to advance we are still abiding by the inhuman end of life care for terminal patients who are in severe pain and ready to be free of pain and suffering.

Things that need to be covered in the paper: You will probably need to explore what biomedical principles this advances (or perhaps risks). What are different moral forms of thoughtfulness that might be used to justify or prohibit this. Is there a moral difference between PAS and passive euthanasia and, if so, is passive preferable? Why/why not?