Eau de parfum and eau de toilette differ mainly in fragrance concentration, although exact percentages depend on the brand and formula. Eau de parfum usually contains more aromatic oils, so it may smell stronger and last longer. Eau de toilette is often lighter, more transparent and easier to wear during the day.
A higher concentration does not always mean a stronger version of exactly the same scent. In many fragrance lines, the eau de parfum and eau de toilette use different note proportions and sometimes additional ingredients. One may emphasize a fresh opening, while the other highlights a warm, woody or sweet base.
Longevity also depends on skin type, temperature, humidity and the application area. A light eau de toilette can work well in summer or at the office, while eau de parfum often suits cooler months or evening occasions. This is a useful guideline rather than a strict rule.
The best choice depends on the desired projection and how you plan to use the fragrance. Test both versions on skin and check them again after several hours. This way, you choose the scent that meets your needs rather than relying only on the concentration label.