Choosing an automated testing framework for a project can be crucial in its success. Selenium is the industry standard in open source automated testing frameworks for web applications, with a test domain-specific language that allows writing tests in various programming languages and compatibility across multiple operating systems. Appium extends Selenium's functionality to mobile apps, while XCUITest and Espresso are popular frameworks for iOS and Android app development respectively, but with limitations in terms of programming languages and platform support. The choice of framework depends on the project's requirements and the team's expertise.