It is true that topical (categorical) pattern of arrangement is generally used with informative rather than persuasive speeches, but it is often appropriate for persuasive speeches with value claims.
A topical pattern is the most common way to structure speeches, particularly speeches of information, because it is relevant to nearly any topic or type of speech. However, you should make sure to explore all other organizational patterns before selecting it in case your topic fits better elsewhere. A topical structure involves dividing your central idea into topic categories or sub-topics that surround the main topic. You should devote roughly the same amount of time to each category and each category should be distinct from each other.
For example, a speech about the benefits of listening to music while exercising could follow a topical structure divided between the categories of how music can increase stamina, decrease boredom, and improve coordination. Each sub-topic or main point is distinct, but ties back to the main speech topic.
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