The chocolate one is served on a "pillow" of angel food cake with berries and is only at CRT. You have to call the cake like to order it and it is $15. It is amazigly beautiful and tasty.
The one at any GF restaurants and also CM is white chocolate and not served on the pillow. It is filled with a chocolate moouse. We had it at 1900PF in November and while it was pretty good, it was more beautiful then tasty, course we aren't huge into white chocolate fans, though I did love the filling. I actually cancelled the CM one had ordered for later in the week though cause it was too much white chocolate and didn't really get eaten like the CRT one had. It was worth the $ though, just for us not twice in one trip.
They are soooo worth the money even if you don't need the dessert (which at 1900PF we didn't.) They are beautifully presented and made my girls feel so special! So worth $15!