For north american audiences what is the most important aspect of speech delivery?

Platform Conversation

For North American Audiences, the most important aspect of speech delivery is whether or not the speech sounds real and whether or not the speech, thus, sounds unscripted—“from the heart,” so to speak.  In fact, the more conversational a speech is, the better it is going to be received by audiences.  This aspect of speech delivery is known as platform conversation.