A little bit of both. Portables have been the most popular systems in Japan for a while, and Nintendo's current position of shipping a portable and a dock that

A little bit of both. Portables have been the most popular systems in Japan for a while, and Nintendo's current position of shipping a portable and a dock that makes it a home console fits very well into that market. Sony has been publishing fewer games that aim directly at the Japanese market, which tends to look for different styles of games than the rest of the world. Microsoft, on the other hand, has been actively seeking those games and making them available via Game Pass and their cloud streaming platform, which what may be driving those unit sales.