Question

Which statement is the best thesis for a compare-and-contrast essay?
One poster presents a humorous cartoon, while the other presents an informative chart and a direct quotation.
These advertising posters are designed to generate discussion and interest in family counseling services.
Though both posters use graphic images, the poster with the mother’s advice presents a more compelling message.
Both posters produced by the local human services board seek to advertise county-based family counseling.

Answer 1

The best thesis is the third:
"Though both posters use graphic images, the poster with the mother’s advice presents a more compelling message."

Why: it sets up a compare-and-contrast by noting a similarity (both use images) and makes an arguable, specific claim (one is more compelling) that your essay can support with evidence about tone, audience, imagery, wording, and effectiveness.

If you want it stronger and more specific, you could revise it to name the reasons you'll compare, for example:
"Although both posters use graphic images, the poster featuring the mother's advice is more compelling because its personal testimony, clear call to action, and emotionally resonant imagery better engage viewers."