Update comparisons.md with Mocha Comparisons

docs/guide/comparisons.md

@@ -53,3 +53,24 @@ For transforming your code, uvu relies on require and loader hooks. Vitest uses
 uvu does not provide an intelligent watch mode to rerun the changed tests, while Vitest gives you amazing DX thanks to the default watch mode using Vite instant Hot Module Reload (HMR).
 
 uvu is a fast option for running simple tests, but Vitest can be faster and more reliable for more complex tests and projects.
+
+## Mocha
+
+[Mocha](https://mochajs.org) is a test framework running on Node.js and in the browser. Mocha is a popular choice for server-side testing. Mocha is highly configurable and does not include certain features by default. For example, it does not come with an assertion library, with the idea being that Node's built-in assertion runner is good enough for most use cases. Another popular choice for assertions with Mocha is [Chai](https://www.chaijs.com).
+
+Vitest also provides out-of-the-box setup for a few other features, which take additional configuration or the addition of other libraries in Mocha, for example:
+
+- Snapshot testing
+- TypeScript
+- JSX support
+- Code Coverage
+- Mocking
+- Smart watch mode (only re-runs affected tests)
+
+While Mocha supports Native ESM, it has limitations and configuration constraints. Watch mode does not work with ES Module files, for example.
+
+Performance-wise, Mocha runs tests serially by default but supports parallel execution with the `--parallel` flag (though some reporters and features don't work in parallel mode).
+
+If you're already using Vite in your build pipeline, Vitest allows you to reuse the same configuration and plugins for testing, whereas Mocha would require a separate test setup. Vitest provides a Jest-compatible API while also supporting Mocha's familiar `describe`, `it`, and hook syntax, making migration straightforward for most test suites.
+
+Mocha remains a solid choice for projects that need a minimal, flexible test runner with complete control over their testing stack. However, if you want a modern testing experience with everything included out of the box - especially for Vite-powered applications - Vitest has you covered.