Whether you use bone-in or boneless largely depends on your personal preference. Bone-in thighs tend to have slightly more flavor and are often juicier and more tender due to the bone's presence. You can also take advantage of crisping the exterior of bone-in, skin-in thighs. Boneless chicken thighs on the other hand are easier to work with and kid-friendly since you don't have to worry about removing the bone when eating. They also cook slightly faster, making them a good choice when you need a quick meal.