Asking me my favorite flower is a little like asking me who my favorite Ewok is. I really don't think about them enough to have a preference. In fact, when I buy flowers for special occasions, I just ask my florist for something varied and interesting and leave it to their imagination. The picture above is their most recent creation for us. They do good work and I trust them.
But since I have to have a particular answer for the list, I'll go with this one: