WWI might be better because it catches people who are skinny but have a big belly and weak muscles, which is more dangerous for the heart than just being overweight.

People with a large waist relative to their body weight are more likely to have a heart attack or stroke later on, even when you account for other health problems like diabetes or high blood pressure.

WWI is especially good at spotting heart disease risk in younger people and those who already have diabetes, high cholesterol, or metabolic syndrome.