If he's going to lie about the details, then say nothing. An honest "I took steroids, and to defend myself, I tried to make MLB and the Yankees look bad. I'm sorry for that. I understand if I won't regain the trust of fans, colleagues, and my teammates, but I'm going to spend every day trying to" would look better than "I'm sorry I was a distraction."
You know Giambi and ARod are viewed very differently.