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I agree with what @somu said. Both have different syntax, but the end result is same. As far as I know the React team encourages to use ES6 class syntax. But if you have written significant portion of your code in older React.createClass() syntax I suggest sticking to it.

Further Reading :

• toddmotto.com/react-create-class-versus-component/
• reactkungfu.com/2015/07/what-react-component-class-syntax-should-i-use/