1. Technology Stack: Clarity Design System is built on top of Angular, while Tailwind Starter Kit focuses on utility-first CSS framework, Tailwind CSS, which is framework agnostic and can be used with any JavaScript framework.
2. Styling Approach: Clarity Design System provides a set of robust, pre-built components with a consistent design language, while Tailwind Starter Kit offers a more customizable approach with utility classes that can be used to style elements directly in HTML.
3. Theme Customization: Clarity Design System offers theming capabilities for adjusting colors, typography, and other design elements to fit a specific brand, whereas Tailwind Starter Kit allows for extensive customization through its configuration file with options to define colors, breakpoints, and more.
4. Component Ecosystem: Clarity Design System comes with a comprehensive library of components specifically designed for enterprise applications, while Tailwind Starter Kit focuses on providing a foundation for building custom UI components tailored to a project's specific needs.
5. Learning Curve: Clarity Design System may have a steeper learning curve due to its reliance on Angular and the need to understand its component library, whereas Tailwind Starter Kit is relatively easier to pick up for developers familiar with CSS and interested in a utility-first approach.
6. Community Support: Clarity Design System has a strong community of enterprise users and contributors backed by VMware, while Tailwind CSS and its starter kit have gained popularity within the broader web development community with ample resources and community support.

In Summary, Clarity Design System and Tailwind Starter Kit differ in their technology stack, styling approach, theme customization, component ecosystem, learning curve, and community support.