Typically, perfume oils are much more concentrated than eau de parfums and eau de toilettes, with a fragrance concentration of 15-30%. Plus, because of their oil bases, they can be gentler on the skin and not so drying (since they contain no or little alcohol).
There are a lot of different types of perfume oils to pick from, and all of them have their benefits. Rollerballs are often highly scented and react with the warmth of your pulse points, so I normally pop a complementary or matching scent of whatever perfume I’m wearing in my handbag and apply it throughout the day as a little scent boost. I also use rollerballs in the evening before bed as a calming scent before falling asleep. It feels less aggressive than spraying on an eau de toilette, and if I ever wake up in the middle of the night, it’s a comforting smell. Solid perfume balms work in the same way and melt into your scent beneath. I find they last slightly longer than a rollerball thanks to the waxy formula.
Then there are perfumed body oils and shower oils. These are super indulgent and definitely amplify any scent you choose to spray on after. If you want impact, perfumed body oil is often more pungent, whereas a shower oil needs to be carried by other scented products such as a cream or a mist, as they tend to be subtler.
These are my top-tier perfume oil picks.