Wrong. Do some research. Wii U stagnated in, like, January or February aka 2-3 months after launch. Switch is doing better now than it was a few months ago, and it will only improve from here.
To be fair, the Wii U did pretty good at launch. If "pretty good" means being outsold by every other system except the Vita and the DS in it's first 2 months, that is.
Seriously, people don't understand how much of a gigantic failure the Wii U was.