Both the PS5 and the Switch are great systems but very different and don’t really serve quite the same purpose.

The PS5 is much more powerful than the Switch, and therefore runs resource heavy games much more smoothly and reliably. Game updates and DLC releases also tend to happen in a much more timely manner on the PS5 than the Switch.

On the other hand the fact you can use the switch as a handheld is a huge plus. The touch screen is great, and as a handheld nothing beats it except the Steam Deck.

I would suggest you spend some time looking at the games catalogue of the respective systems, since there are a few games exclusive to each platform; and for cross platform games, read reviews on how the ones that most appeal to you play on each system. There will be differences.

There is no universal right answer. They are just different systems, so it depends what games you want, and how important handheld is to you versus performance