Perfume essences need a carrier substance. Usually that is alcohol, but there also are solid waxes and oils.
What base do you prefer?
Are you all for sprayable alcohol?
Do you prefer portable solids?
Or are you partial to skin-friendly oils?
Is your favorite perfume available in your favorite incarnation?
For ease and practicability, nothing beats alcohol-based fragrance. Spritz and go, no more worries. Also alcohol is the carrier of choice for the large majority of available perfumes.
I like the skin-saving properties of oils though. I have very reactive skin and alcohol tends to exacerbate any sensitivities I might experience from the perfume and is an irritant in itself.
The disadvantage of oils lie in the fact that I don’t dare to wear a silk scarf that day (I know, a classic first world problem!).
Solids have the great advantage of being easily transportable and spill-free, oils are sensual and caring, alcohol-based perfumes are quick and easy to apply.
I like it when a brand offers more than one option for the same scent (like Aftelier, Diptyque, Téo Cabanel…).
What is your preferred form of perfume?