Every kind of business structure has different advantages. For sole proprietorship, because you are the only owner and operated the business then you have fewer formalities and legal restriction will get fast approval to obtain business license.
Because you have no partner, then you have complete control for the business. You can do anything that you want because you didn’t have responsibility to other people. There is no other boss, except your customers. And the most obvious benefits is you are not required to share profits with anyone.