Please provide answers in detail, So that we could clarify that which one is to choose, Web driver or Selenium RC.
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Maybe this question I asked several months ago on stackoverflow can do some help to you: http://stackoverflow.com/questions/9781940/selenium-vs-webdriver-any-obvious-advantages
The main advantage is that a Webdriver and RC suites are they allow you to use a programming language in creating your test scripts (not possible in Selenium IDE).
Following programming languages are supported by WebDriver (but others have some 3rd party support)
Where they differ;
WebDriver is faster than Selenium RC since it speaks directly to the browser uses the browser's own engine to control it
WebDriver can also support HtmlUnit. A headless browser which is very useful in certain circumstances.