The legs, or brown meat, of a chicken have more flavour than the breast and take longer to cook. They are sold as whole legs, drumsticks (the lower half of the leg) or thighs.
The thighs are sold prepared in a variety of ways: whole; on the bone with the skin on; off the bone with the skin on; or boneless and skinless (called thigh fillets). The latter is the most expensive but the most convenient if you're planning to pan-fry strips of thigh in a stir-fry or curry. For stews, roasts and casseroles, thighs are best cooked on the bone as this will impart lots of flavour during cooking and help keep the meat moist.
Article by Louisa Carter