In terms of 3rd party software released in 2019 the PS4 is stomping on the Switch's head and is a massacre, and the Switch is massacring the PS4 in an even worse matter in terms of 1st party software released in 2019.
But in terms of titles released in 2019, remember PS4 has the following that all have sold more than 200k retail:
Ace Combat 7
Call of Duty Modern Warfare, Days Gone, and Devil May Cry V are just under 200k
The Switch has the following that all have sold more than 200k retail.
Jikkyou Power Pro Baseball and Yoshi's Crafted World are just under 200k.
Pokemon pushes it solidly in the Switch camp due to its massive force, but the lists aren't all that different.
EDIT: Forgot Ring Fit, that makes it less even than I thought. I initially thought Judge Eyes was this year but it was the end of last year.
To clarify, I was talking about sheer number of units solid, not necessarily listing how many games sold a certain amount. As you say, Pokemon alone skews it heavily in Switch's favor. (I'd also argue 3rd support isn't quite as lopsided as you indicate, at least if you strictly look at Japanese developed stuff).