Recently I bought a NDSL, I think it's the best game console I've ever tried. I have to admit, I've never tried PSP, but that's only because before buying the NDSL, I analyzed web reviews and according to many reviews the PSP still needs to be developed further.
I love the NDSL's dual screen, esp. having the touchscreen feature which in my opinion is key for gadgets to attract buyers today. Anything cool with a touchscreen is bound to sell itself.
I also like the fact that you can use any gameboy cartridges on the NDSL, and best of all it's Nintendo: a very wide selection of games are available!
I've tried the first-ever gameboy, the sega gamegear, gameboy advance, gameboy advance sp (pretty cool!) but I have to admit - nothing beats NDSL for now.
