A Topper covers only the top of the head, the own hair on the sides and back of the head mix with the topper hair. Therefore, it is important that the topper matches the color of your own hair.
A wig encloses the entire head, and your own hair is not visible (in the case of wigs without lace front, your own hair can be pulled out at the front for better concealment). A wig must therefore not necessarily correspond to the own color - here you can live out!