Switch is just the 4DS in Japan. Pokemon and Brain Training dominating the market.
Famitsu Sales: 12/23/19 – 12/29/19
Software Sales (followed by lifetime sales)
[NSW] Pokemon Sword / Shield (The Pokemon Company, 11/15/19) – 243,476 (2,988,134)
[NSW] Luigi’s Mansion 3 (Nintendo, 10/31/19) – 59,349 (505,998)
[NSW] Ring Fit Adventure (Nintendo, 10/18/19) – 52,521 (495,639)
[NSW] Minecraft: Nintendo Switch Edition (Bundle Version Included) (Microsoft, 06/21/18) – 40,905 (1,145,939)
[NSW] Mario Kart 8 Deluxe (Nintendo, 04/28/17) – 40,883 (2,659,009)
[NSW] Mario & Sonic at the Tokyo 2020 Olympic Games (Sega, 11/01/19) – 40,866 (195,128)
[NSW] Super Smash Bros. Ultimate (Nintendo, 12/07/18) – 35,385 (3,453,052)
[NSW] Dr. Kawashima’s Brain Training for Nintendo Switch (Nintendo, 12/27/19) – 34,696 (New)
[NSW] Super Mario Party (Nintendo, 10/05/18) – 34,649 (1,263,710)
[NSW] Tsuri Spirits Nintendo Switch Version (Bandai Namco, 07/25/19) – 33,623 (336,995)
Hardware Sales (followed by lifetime sales)
Switch – 141,227 (10,338,048)
Switch Lite – 93,041 (1,045,383)
PlayStation 4 – 59,123 (7,353,273)
PlayStation 4 Pro – 22,226 (1,394,970)
New 2DS LL (including 2DS) – 2,875 (1,690,122)
New 3DS LL – 170 (5,885,915)
Xbox One X – 195 (18,642)
Xbox One S – 102 (92,604)
PS Vita – 53 (5,863,016)