They are different monsters.
Gaultier 2 is very sweet and all about amber and vanilla - lots of vanilla. Fleur du Male is marketed as a rare "floral scent for men" and is all about orange blossom, especially the initial topnotes.
With both of these, I was initially very put off by them - thought they were horrible. But there was something about them that kept making me want to go back to the store and keep smelling and sampling them, multiple times. I now own and love both of them, and I get great longevity and sillage from both of them.
So definitley sample these before you make a purchase. Seems like most people either really love or really hate JPG fragrances.