Wonderful adaptation of Plutarch's Antony. I read Plutarch first and then read Shakespeare's adaptation and knowing how the story ended actually helped me enjoy the Shakespeare version more.
Given a choice, I have to say that Plutarch remains for me the more enjoyable of the two, perhaps because it tells the whole tale of Antony's life rather than just the end. In Plutarch we get a richer knowledge of Antony including his many victories and his popularity with his soldiers.
I recommend reading both to see how two masters handle the same material in different genres.