Nintendo has confirmed that Pokémon X is more popular than Pokémon Y, at least in the U.S. Here are the official U.S. sales figures from Nintendo through the end of December 2013: Pokémon X: 1.63 million, Pokémon Y: 1.54 million.
We here at Kotaku have been wondering which version of the latest Pokémon game was more popular. X or Y? Whenever we've asked Nintendo, they wouldn't tell us. But perhaps there are other ways to tell?