In CY2017, in Japan, PS4 hardware will outsell Switch hardware. It will also outsell 3DS hardware.
edit: mini-rationale
* Low impact of Arms tells me the blue ocean has not yet come back to Nintendo (at current pricing at least)
* In Splatoon 2, Nintendo is just now launching what is IMO the last of its strongest own titles this year; no Pokemon before 2018; I don't see Xenoblade 2 / Mario Odyssey touching either of Splatoon / Zelda / Mario Kart. Splatoon 2 preorder activities have been noted and considered.
* In general Nintendo keeps flubbing its software launches with weaksauce Switch hardware availability. This will continue.
* Reported preorder activities tell me DQ XI has a good shot at selling best on PS4, giving a good boost (remember, just like the 2DSXL, PS4 is not made of components), sucking up even more short-term 3rd-p investment
* 14nm is ramping up, PS4 / Pro pricing may change before the year is over; for Switch, impact will be lower because of non-silicon cost drivers and poorly managed supply