Good question; we may never know unfortunately now that software tracking only covers reported shipments.
PS4 has the install base advantage, but on the other hand you'd think a BOTW clone would do well on the system that has and is in large part defined by BOTW.
Then again, a lot of Switch owners also have a PS4; for those it'll be a matter of whether they want to play it in high res or on the go.
Ubisoft has given specifics at times, such as Starlink doing best on Switch. It's not impossible, especially if Nintendo and Ubisoft reveal some sort of Starlink/Star Fox moment.
The Democratic Nintendo fan....is that a paradox? I'm fond of one of the more conservative companies in the industry, but I vote Liberally and view myself that way 90% of the time?