Although it has been pointed out that there is a slight issue with deferring, if you do that, and you end up in a situation where it's still tied after both teams have had a possession. It seems to me you'd want to be the team who gets the ball first when sudden death starts.
You don't want to defer, you want to choose Defense first. If you defer, you give the other team the choice and they will use their choice to choose Defense first and you'll be stuck getting the ball first.