To help you choose, we describe each scent in three stages: opening, heart and finish. They are about perception, not a precise timetable: the same scent can come across differently from one person to another.
The opening is your first impression. Bergamot brings a citrus accent to Relax; in Mojito, lime meets mint. If you like bright scents, these two are a good place to start.
The heart is the main character of a scent: lavender in Relax, ylang-ylang in L’Amour or eucalyptus in Refresh. Compare these notes when choosing between herbal, floral and fresh.
The finish is the overall impression a scent leaves. How long it lingers on the skin or in the room varies and is not guaranteed. To scent the room separately, choose an oil compatible with your diffuser and follow the instructions for both.