Final answer:
Clark believes Allison's jack-o'-lanterns are better because he admires her artistic skills and attention to detail, finds them more creative and unique, and appreciates the effort she puts into carving and decorating them.
Step-by-step explanation:
Clark truly believes that Allison's jack-o'-lanterns are better because he admires her artistic skills and attention to detail. He thinks her jack-o'-lanterns are more creative and unique compared to others. Additionally, he appreciates the effort she puts into carving and decorating them. While he may not explicitly mention finding them scarier or more impressive, these factors contribute to his belief that her jack-o'-lanterns are superior.