Here's what I wrote to her in a PM, thought I'd share here.
If you like a softer feminine bag good for shopping or a fancy event, get the
L'Epanoui. It is especially good for shopping because I find that it carries well underneath the arm or swung to the back like a Papillon, and the S-lock is VERY secure. The leather is also much plusher and softer and it really showcases the grain, and this bag is BIG (love it)! Overall it is a much more feminine bag than the Le Fab. (BTW, the PM is
very cumbersome. Cute, but hard to use. GM is super easy!)
If you need a strong tote and want to make a statement (like wearing a Chanel or St. John suit) for business functions or lecture dinners, get the
Le Fab. Basically when you need to carry a lot of papers and are not afraid to have an open top bag, you would use the le Fab. I would not recommend this for shopping unless you're making a trip to the LV boutique only.

It tends to set down very hard and may upset SA when you put it on glass counters, lol. It is a very business-y and attention-grabbing bag, and makes a much bolder statement than the L'Epanoui.
Both bags are nearly the same size, for your reference. They can both be carried on the shoulder or hand depending on your preference. I like the Le Fab's rolled leather handles, but you can't adjust them like the L'Epanoui -- so depending on your body type you may or may not be able to put the Le Fab under your arm.
In time, you should get both bags, lol.

But you should decide which is best for you now.
I recommend the L'Epanoui now because you already have a tote, and it's totally different and brand new from LV, also slightly easier to use.
Let me know what you decide. Hope this helps!