Here is my first impressions about the differences between La Vie Est Belle and Oui La Vie est Belle.
I wore them on two separate days. I would say that they had similar longevity rates on my skin, leaving a soft scent on me in the evening after a full day of wear. In my opinion, Oui is fresher, but also a bit more mature. Whereas the original is very sweet and floral.

Oui La vie Est belle Eau de Parfum
$102 for 1.7 oz
Notes:
Top: Bergamot, pink pepper and raspberry accord Mid: Rose centifolia, ylang ylang and jasmine
Base: Patchouli, gourmand accord and iris
I think they will probably appeal to the same person just on different days. When do you want to just smell nice vs when do you want to turn heads towards you. I would say both smell very feminine.

La vie est belle Eau de Parfum
$118 for 1.7 oz
Notes:
Top: Iris padilla
Mid: Patchouli
Base: vanilla, with spun sugar
What I will say that in terms of creating a flanker, Lancome did a great job in keeping it so that Oui still references the original. It doesn’t smell like a completely new creation, unlike some of the flanker comparisons I have smelled before.
I would say give both a try if you into more girly floral fragrances. If you prefer sweeter, go for the original. If you prefer fresher, go for Oui.
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