and if I had the choice between
Maddie and
Madeline I'd choose to go by
Madeline. Sure people are still CALLED by their nicknames, but they can put a full name on official documents and they can introduce themselves with their full names at business meetings. I'd be so embarrassed having to go to a business meeting and introduce myself as
Maddie or
Abbie, it sounds so unprofessional.
Just my opinion, though.