Nintendo DS or Playstation Portable?  

Nintendo definatly. Psp sucks. it is way to expensive.

Nitendo DS is my choice coz Mario and Luigi in it.

BOTH OF THEM , both of them are very useful by myself~

Thar game of NDS is much better than PSP.But if you use to listen to music,PSP is better.

For me personally i prefer nintendo ds alot more than psp, cos of gameplay is much better in ds. PSP has better graphic, screen size, precise pixels of image quality, but the storyline is similar with PS one. Thus, DS has much more interactivity and more fun, friendly use for all age users.

I have never tried DS yet..So i still prefer PSP because of can surf the web via wifi, hear my fave songs, play my fave games and watch a movie ..

NDS is the real handheld, PSP is more like a brick ready to be thrown to. I use PSP mostly just to play emulated games, yeah old games from SNES and Sega Genesis age. NDS rocks, although not all games use the stylus, good games keep pouring down to NDS, and that's the most important thing.

PSP just pwnz a NDS, you can watch movies, listen to music, play games, play on the internet. And what can you do with a nintendo DS play games with a touchscreen and play games were you can see the pixels. Yeeeeeeh. PSP just pwnz and these days it's relatively cheap!