A unisex perfume is designed to be worn by anyone. Unlike many women's and men's perfumes, it does not have a tone that feels clearly feminine or masculine. Sometimes a unisex perfume can fall somewhere between masculine and feminine expressions, but can just as easily have its own character and therefore not need to be placed in the traditional classification.
Whether you want a familiar scent or find something that suits you, it is ultimately how the scent feels on your skin that determines. If you feel most comfortable with women's perfumes, a unisex perfume can give a fresh and well-dressed impression without being too sweet. If you feel most comfortable with men's perfumes, it can feel clean and stable without being too heavy. It is not designed for a specific gender and can also suit those who do not recognize themselves in traditional gender roles. Choose what feels right and smells good, simply.