There are several differences between Sony's handhelds and the Switch.
First off the PSP launched at $250 with a $20 memory stick needed to play most games. That was back when the DS launched at $150 with no memory stick needed. Adjusted for inflation the cost of a PSP and memory stick in 2005 was $330. That's even more expensive than the Switch, with a direct competitor for $120 less.
Neither PSP or Vita could play games at home on a big screen T.V. without already owning another console.
Vita doesn't have a library of exclusives. It was just a port machine all the way through. The only good Vita game that wasn't playable on another system was Ys: Memories of Celceta.
Finally, the PSP and Vita weren't console quality. Maybe the PSP was if you stack it up against PS2. But the Vita definitely wasn't.







