Hermes has the best IMO.
You have to realize that creating a shower gel that smells like the fragrance itself is not an easy job. A perfumer actually has to sometimes create a totally different fragrance profile to 'work' with the shower gel ingredients (as opposed to the fragrance ingredients). Hermes is one of the houses that has the $ and resources to spend in testing and creating ancillary products that smell strikingly similar (if not better) than the fragrances themselves.
I highly recommend Eau des Merveilles, Kelly Caleche and Eau d'Orange Verte shower gels. You can also find many of these heavily discounted online. I bought mine at Imagination Perfumery.