Rhetoric and Propaganda Propaganda is a type of information. Rhetoric is a style of speech or writing. They overlap where the mode is speech or writing, the style is persuasive, the intent is to foster bias for a political group/ideology or power structure, and the content is misleading/contains falsehoods.
So, the first distinction is of category (type of information vs mode of presentation of information). The second distinction is of content. While both seek to persuade, only propaganda is necessarily misleading and necessarily seeks to foster bias for a political grouping/ideology as opposed to simply a point of view. There's also a distinction of mode, rhetoric presumes speech or writing, propaganda can occur in other semiotic modes, pictures, signs etc.
(Some caveats to the above if anyone wants to jump in and debate my take.)