They are the same meaning. 'In this world' is more common, so 'on this planet' injects more hyperbole.
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Mister MicawberThey are the same meaning. 'In this world' is more common, so 'on this planet' injects more hyperbole.Thanks, sir. I got the point. Thanks for answering my question
Mr WordyThey mean much the same thing, but "on the planet" sounds more extravagant and colourful, and is less appropriate in very formal text.Thanks, will great that. I got the point
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