Sometime it’s important to have reference notes. They contain further information regarding concepts in the main presentations. In essence, the assist the presenter explains crucial points from an informed perspective. Also, the audience can get a chance to see the sources of the information for a later read!
Speaker notes have key backup points and are fully referenced. The presenter can thus mention names of authors in during presentations to prove his or her knowledge on the subject. It is highly advisable to have speaker notes.
See the image below