Macro partitioning

Low-carbohydrate diets improve triglycerides and HDL more effectively than low-fat diets, while low-fat diets are more effective at reducing LDL cholesterol.

If your main issue is high triglycerides or low HDL, a low-carb diet may improve your heart health markers more than a low-fat diet. If your main issue is high LDL cholesterol, a low-fat diet might be more effective for that specific number. Consult a professional to interpret your full lipid panel.