1. Code Smell Detection: Reek focuses on detecting code smells in Ruby code, providing specific feedback on potential issues related to code readability and maintainability. On the other hand, SonarQube supports multiple languages and offers a wider range of code quality metrics beyond just code smells.
2. Rule Customization: Reek comes with a predefined set of rules for code analysis, limiting the customization options available to users. SonarQube, however, allows users to define and customize their own coding rules based on their specific project requirements and coding standards.
3. Integration with CI/CD: SonarQube seamlessly integrates with Continuous Integration/Continuous Deployment (CI/CD) pipelines, providing real-time feedback on code quality and security issues during the development process. Reek, on the other hand, may require additional effort to integrate it into CI/CD workflows.
4. Static Code Analysis: SonarQube performs static code analysis across the entire codebase, identifying potential bugs, security vulnerabilities, and code smells. Reek, being more focused on code smells, may not offer the same level of comprehensive static code analysis as SonarQube.
5. Community Support: SonarQube has a large community of users and contributors, providing ongoing support, updates, and extensions for the platform. Reek, being more specific to Ruby code analysis, may have a smaller community compared to the broader user base of SonarQube.
6. Scalability: SonarQube is designed to support large-scale enterprise projects with complex codebases, providing scalability and performance optimizations for analyzing vast amounts of code. Reek, with its focus on Ruby code and code smells, may be more suitable for smaller-scale projects or specific code quality improvement tasks.

In Summary, Reek and SonarQube differ in their focus on code smells detection, rule customization options, integration with CI/CD pipelines, scope of static code analysis, community support, and scalability for enterprise projects.