You can read the complete Article #2 and Analysis here:
Switch vs Wii – VGChartz Gap Charts – October 2019
Switch Vs. Wii Global:
Gap change in latest month: 408,110 - NS
Gap change over last 12 months: 2,230,955 - Wii
Total Lead: 9,689,903 - Wii
Switch Total Sales: 40,736,064
Wii Total Sales: 50,425,967
I'm still of the opinion that Switch can (and will, unless Nintendo stupidly cut it short prematurely) catch up and outsell the Wii eventually.
Wii got 4 years of support, then was abandoned overnight. Unless the make the same mistake again, Switch can last longer and leg it to victory.