According to a New York Times reporter who spoke to Reggie, Verge reports that The Switch outsold any console launch in Nintendo's history in its first two days. BoTW also outsold any non-pack in game for any Nintendo launch as well.
Source: http://www.theverge.com/2017/3/6/14836170/nintendo-switch-broke-sales-records-americas-zelda-two-day
However, this is Reggie we are talking about; Reggie through a reporter reported by The Verge. So we shall see how this pans out.
------------
Japanese Sales: https://prtimes.jp/main/html/rd/p/000003117.000007006.html. First number on this website is the Switch's HW numbers and the second is BoTW's SW numbers. All sales numbers are estimates of Famitsu.
Switch JP Sales: 330k+
All other relevant consoles in Japan (http://gamrconnect.vgchartz.com/post.php?id=8329271) :
PS4: 322k
Wii U: 308k
3DS: 374k
Vita: 324k
Wii: 371k
DS: 468k
PSP: 160k
