pomme vernis: french purse or pochette wallet?

They are two differently shaped wallets. I would take a look at the bags you already have and see which would fit best. Personally, I like the look of the FP best, however, the Pochette Wallet (PW) is more functional. I am able to keep my cash flat (unfolded) in the PW, which I like. The main slot for bills in the FP is very deep and not accommodating for American bills, in my opinion.
 
I'm getting a pochette wallet because it's a more practical design - as mentioned above, it takes banknotes flat. The french wallet would only be more practical if you like very small bags that a 7" wallet won't fit into.