The brackets are made of translucent material, which is less noticeable and more esthetic. Some come with tooth-colored wires as well, which makes them even more camouflaging.
They are less visible than metal braces.
They cost higher than metal braces but are much lesser than completely invisible braces
They don’t interfere with making X-rays. (Metal braces are visible on X-ray).
They are more expensive than metal braces but are cheaper than completely invisible braces.