DS might be more your thing by the sounds of it. Invizimals was kind of Sonys take on Pokemon with a twist to it, but you could also go with the Psp and get the original Invizimals game.

Honestly, both systems are great with great selection of games, just DS has more puzzle style games because of the bottom touch screen, where Psp plays more traditional console style games, just on the go. Psp also has better graphics and much better screen.

Either one you choose, your getting a great console with excellent game library 👍....but I will say I personally liked the Psp more.