Thoese are Fragrance oil, not essential oil though.
They actually label each fragrance oil in the store to highlight the effect.
You can also check with them.
I personally like mixing Satsuma(orange) and Vanilla together.
Or use African Spa only.
If you wanna go for essential oil(the body shop in Canada do not offer essential oil except for tea tree oil), I suggest you look for Lavender or lemon grass. Lavender is good for sleep and relaxing. Lemon grass can refresh you for the day.