Leader or Manager – Who is More Valuable?

Everyone today talks about becoming a leader but what happened to the manager? Reading the Daily Drucker, I have noticed that many times, Dr. Drucker the author of modern management, mentions “manager” but we can also insert the word “leader” into many of his writings without distorting his intent. Is being a leader a higher level skill than what seems to be the lower level skill of an manager? There are several key differences between a manager and a leader and my research highlights the similarities and differences