Hi

I have and love both of them. Lily fits more than Felicie (because she’s wider), so if you want a really small bag, Felicie would be the choice.
Both come with a chain strap, but Felicie is 200€ less (to put towards a canvas strap) and comes with two inserts, so offers a better value for money imo.
Compared to Felicie, Lily doesn’t open as wide due to a stiff construction and thick canvas of the bag (and naturally, the flap). Hence, I find Felicie easier to use (open & close). When it comes to the look, Lily looks more elegant and interesting to me personally (due to the golden plate on the front and the nice chain with LV in a circle detail). So it depends on which aspects are important for you.
Another option to consider would be the Ivy, which offers a similar amount of space as Lily, is flexible and easy to open & close as Felicie, comes with a strap and a chain for more options, and can be dressed up with the chain.
Pics of all three attached - hope it helps! Good luck deciding.
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