I have them both, and to my nose they are unrelated. I think of Nahema as "Mitsouko Rose", which makes it a bit tricky for me since I don't always get along with Mitsouko, but when the stars are aligned properly I think it's simply glorious, and worth the occasional contrariness. But Chamade is one of my life-long favorites; I was a small child when I got my first mini bottle of the parfum, and it's been love ever since. I may be a bit biased, but to me there is nothing prickly or challenging about Chamade, which is always sunny and glorious, and absolutely defined by its greeny-gold polleny florals, provided primarily by its galbanum and hyacinth (which I believe Nahema also has, but it's very muted.) I consider Annick Goutal's Grand Amour a sister-scent due to this dominant note, and also HÃ¨rmes Rouge ...I don't know exactly what's doing it here, but they share a very specific and definitive accord. At any rate, my choice would be Chamade ...unless I'm in the mood for sweet and sour roses, then it would be Nahema, if it had to be Guerlain.