1. Integration Level: React Helmet focuses on managing the document head of a React app, allowing developers to control the title, meta tags, etc., dynamically. On the other hand, Storybook is a tool for developing UI components in isolation, providing a sandbox environment to see individual components.
2. Purpose: React Helmet is primarily used for improving SEO by dynamically updating the meta tags and titles based on the content being rendered. Storybook, however, is more focused on showcasing and testing individual components in isolation during the development process.
3. Target Audience: React Helmet is more suitable for developers concerned with maintaining a consistent and optimized document head for better SEO performance. In contrast, Storybook is ideal for UI developers and designers who want to work on and test components independently.
4. Functionality: React Helmet offers a specific set of features related to managing the document head and SEO optimization. Storybook, on the other hand, provides features like component documentation, testing, and interactive development environment for designers and developers.
5. Dependencies: React Helmet can be used with React applications to enhance SEO capabilities without additional dependencies. Storybook needs to be integrated with various front-end libraries and frameworks, like React, Vue, Angular, etc., to isolate and develop components effectively.
6. Impact on Development: React Helmet impacts how the web page is presented in search engine results through optimized meta tags, while Storybook impacts the development process by facilitating component isolation, testing, and documentation to enhance the overall UI design and development workflow.

In Summary, React Helmet is focused on managing the document head for SEO, while Storybook is geared towards developing and testing UI components in isolation.