Both products contain the same total amount of pheromones per bottle, as well as our signature For Him fragrance. The difference comes down to concentration and application method. Our oil is a smaller bottle, but the fragrance and pheromones are more concentrated, requiring less to apply for your desired fragrance effect. It is applied through the stopper, similar to other essential oils. Our For Him Cologne Spray has, of course, a sprayer, which can be an easier application method for some.