As I posted it, I'll start.
Day to day I call him "Love", it's my way of saying what I really mean without actually saying it. Ya know, to not offend co-workers and what not.
At home or in private he's "Daddy" and depending on the scene he may be "Master" as well.
I prefer to be home with my Daddy. Walking out of work at night with him and getting in the car, usually the first words that spill from my lips are "I love you, Daddy!"