Quite simply, because Nintendo is very strong in all markets (USA, JP, EU), Sony only owns Europe and the USA (which are also dominated by Nintendo).
If Nintendo continues to do very good marketing like they did with the Wii / DS / Gameboy, then Nintendo consoles will always be above PlayStation in terms of sales.
That's why I think the Nintendo Switch will surpass sales of end-of-life PS4 and PS5, quite simply because it has a big lead over the PS4 in the US, Japan and Oceania.

Um no? PS1 102 million. More than Wii. PS2 best selling gaming system ever made. Even more than DS. Sony supports their consoles in the final year with big exclusives where Nintendo mostly abandons them in the final year. Sony is the only one who has sold 3 home consoles to make it over 100 million. The switch will likely finish in the 110 million range and PS4 probably has another 10-15 left in it.

It doesnt always exceed playstation though

Nintendo Switch has a 6 million lead over PS4, I wanted to talk about portable consoles for Nintendo only, Sony is unbeatable in the home console market.
I was making a comparison between Nintendo portable consoles and Sony home consoles

"In general will always in general"

Sorry, my bad

If Nintendo never releases a Switch 2 this will certainly be true.

Nintendo can't be beaten. Except when it's beaten. Then it's beaten. But not if it's not beaten.

Uh oh...