I would have to say DS, because the PSP has some decent games, but the controls suck, the graphics, are crappy, and yeah besides the music you can store on it, i think you can put movies on it I think? Nonetheless, the DS is always a good buy because you've got the classics like Castlevania, then you have the Metroid Games that are out for it, then you've got the new and improved Mario Kart for DS, and the fact that it has two screens is pretty damn entertaining. So I would go with the DS.