Why Selenium IDE
To learn about concepts on automated testing and Selenium, including:
Selenese commands such as type, open, clickAndWait, assert, verify, etc.
Locators such as id, name, xpath, css selector, etc.
Exporting test cases in various formats.
To create tests with little or no prior knowledge in programming.
To create simple test cases and test suites that you can export later to RC or WebDriver.
To test a web application against Firefox only.
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Why Selenium RC
To design a test using a more expressive language than Selenese
To run your test against different browsers (except HtmlUnit) on different operating systems.
To deploy your tests across multiple environments using Selenium Grid.
To test web applications with complex AJAX-based scenarios.
To use a certain programming language in designing your test case.
To test applications that are rich in AJAX-based functionalities.
Learn more about Selenium Interview Questions in this blog post.
Why Selenium Grid
To run your Selenium RC scripts in multiple browsers and operating systems simultaneously.
To run a huge test suite, that need to complete in soonest time possible.
To execute tests on the Html Unit browser.
To create customized test results.
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