Hmm I certainly think its gonna be close, mostly because there won't be a third version this time, which is probably part of the reason why Pokémon games are usually so launch heavy in their sales. I could honestly see both of these games crossing 25 mil.
But I think BotW will be the winner when all is said and done because it's legs have just been incredible so far and its pretty much gotten the same must-have status as games like Skyrim and the Witcher 3 which are both absolute monsters sales wise.
- Switch - 27m
- PS5 - 15.5m
- Xbox Series - 10m