I love my switch but never really use it handheld.
Its rather hard to explain why. But I will try.
EDIT- Ironically I was typing this reply out whilst John mentioned what this console was above
So then, With a 3DS or Vita game, the visuals and game are tailored or programmed to look and play well on a handheld.
on the Nintendo Switch, it always feels like I've shrunk my 42 inch TV experience of playing the switch at home to fit into my rucksack.
Therefore the games do not adapt to the small screen, they just play exactly like they would on a large TV.
I think the screen is far too small for them sometimes because of this. Zelda especially.
other than that bonkers assessment, the Switch is one of the best things Nintendo have made recently
so long as they don't drop the thing in the next 5 years or so and keep supporting it.