I see this cropping up from time to time - interviews with Psychologists, Physicists, Biologists, and the question is reduced to Free Will or Determinism.
I am clearly a firm believer in Free Will - and that the question itself is a red herring that paints one into a corner - much as asking someone "Would you prefer to die by drowning or hanging?", when, in fact, that someone had no intent of dying whatsoever and so the question is irrelevant.
Determinists subscribe to the mechanical view of the universe as laid down by Newton or Galileo, that cause follows effect, that we, as people, are of necessity driven by a thousand subconscious "causes" of which we can recognize only a few at a time. These "causes" result in most of the largely unconscious day to day decisions we make. Therefore we can be seen as being driven by unconscious urges and reaction to external forces and cues such as advertising, peers, society, people in the street, etc, etc...
They would argue that as we are largely unaware of the forces that shape us and control our behavior we are therefore little more than automatons, admittedly with a very complex programming, but automatons nonetheless.
To a degree this is true - but like many things it's a question of degree. We are all - to one degree or another - Schizophrenic, Neurotic, Obsessive, etc, etc - but our place on the scale of labels determines whether we take it as part of our identity or not.
I personally disagree with a great many of the physical and psychiatric diagnoses handed out for the sole reason that it disempowers the patient and takes away the ability for them to try and effect positive change and accept responsibility for their actions. Not that they are necessarily responsible for their disease or condition, but people that accept helplessness never get better, people who accept responsibility and take action occasionally do. A cancer patient might resign himself to a terminal outcome on the recommendation of their physician, when they could instead be making adjustments to their lifestyle and attempting to remedy the causal factors that led to the cancer. And I've met a lot of mentally ill people that seemed to accept their illness, as opposed to attempting to understand and control it. No diagnosis should be an excuse or a defining part of anyone's character or circumstance.
I fundamentally disagree with the question and would argue that a better question might be "How can we best reduce the influence of internal arguments and external influence to achieve the results that we truly want?". This, then, supposes we have some agency in our fate and by the very supposing we take responsibility and agency.