Vincent,
I am a big fan of muscadines. It is a species of American grape that thrives in hot, humid conditions and is quite disease-resistant compared to other grapes. It also has a strong, unique flavor, similar to but unlike any other grape species. If you are a fan of strong-flavored grapes like Concord, you will like muscadines. Purple skinned ones are known as muscadines while bronze skinned ones are known as scuppernongs. I prefer purple ones. The Fry variety of muscadine is one of the most common ones, but there are dozens of varieties. I do not know whether any are available in France.
I am also a big fan of muscats, Thomcords, and the Grapery's offerings (Cotton Candy, Gum Drops, etc. but they cannot be grown by private individuals, yet). As you can tell, I like my grapes to have strong flavors.