A person takes one chloresterol medication. Is it best for the person to use butter or margarine on breads? What is the final opinion on this?

Final opinions. Final opinions change with evolving data and information sets. We presently are anti trans fat and getting less upset about saturated fat. Next week, month, year?...... moderation of intake of fats and avoidance of trans fats is the present reasonable advice. There are also alternatives including nothing to spread on bread.