I love Camilla, though I'm also fond of Camille.I'm acquainted with two girls named Camille -- one adopted the nickname Cami, and the other adopted Mila.
I like both. Since I am brazilian, Camilla seems more natural to me (our feminine names usually end in a, the ones ending in e are adopting the french spelling). I had several high school friends called Camila, they usually adopted the pet form Mila.