While the Vita never found much of an audience in the West, it was actually quite popular in Japan, with over a third of its total sales coming from this single country alone.
As of Media Create's latest numbers, however, the Switch has overtaken Vita's LTD sales in the Land of the Rising Sun, standing at just over 6 million to Vita's 5.96 million.
https://gonintendo.com/stories/324826-switch-has-surpassed-the-vita-s-total-install-base-in-japan