Chicken is healthier than beef because chicken contains less saturated fat and less cholesterol which means that the chicken meat is much healthier for your heart and cardiovascular health.
But beef also contains more iron and zinc than chicken does.
But you can eat more chicken and still be healthier than eating the same amount of beef.
Beef is healthy in moderation but eating too much beef could cause heart attacks, strokes, heart disease and blood clotting due to clogged arteries.
Beef can be really fatty and greasy and should be eaten in moderation.
But chicken contains less of that fat and grease content so you can eat more chicken than you can eat beef.
If you eat beef and chicken then your health will improve but eat less beef and more chicken to stay healthy.