There are certainly advantages to choosing alcohol-free perfumes over perfumes containing a high amount of alcohol and water. 

First, pure perfume oils are much more pleasing to the nose, and they are also longer lasting than perfumes with alcohol. In addition, when you smell perfume oil, you can immediately pick up on the scent, as it is in its pure form. Some perfumes with heavy alcohol contents smell like a big mish-mash of scents, making it hard to decipher top notes, middle notes, and base notes. 

Keep in mind that perfume oils are a lot like other products, such as shoes and clothes. Sure, there are cheap oils, but their scent will be not be as authentic and refreshing as the pure oils. 

When you purchase alcohol-free perfumes, it is wise to find out exactly what the ingredients are before buying. 

Many commercially sold perfumes are made with fillers, namely alcohol, that causes the scent of the perfume to evaporate faster. When you first spray a perfume with a high alcohol content, it tends to smell strong. However, within an hour or two, the scent of the perfume has evaporated considerably, which means you cannot smell it as well, if at all. 

Alcohol-free perfumes last longer, and they go on much more subtly. This means that when you walk into a room, people don't smell you before they see you.
Remember, alcohol and perfume oils do not mix. First, alcohol will diminish the scent you are trying to capture, and it will cause the fragrance to evaporate faster.
In addition, alcohol can be drying and irritating to the skin, causing some people with sensitive skin to have bad reactions.
Finally, alcohol-free perfume smells clean and simple, not overpowering or cluttered like some commercial scents.