I have the entire line and I can say they are all very different.
Eau de toilette (black bottle) the most musky and smoky of them all.
This is the original scent. Nice floral top notes with musk dry down.
Eau de parfum (pink bottle) is much more floral. Same base notes, but the floral top notes are most noticable and last longer.
L'eau (clear bottle/pink inside) the most "sheer" of them all - has a fruity note close to watermelon (the water note), and very floral.
Very little musk. Summery and light, but suprisingly l'eau is very long lasting.
I enjoy them all, and hope you find one you like!