ok, people...they were both made for two seperate purposes.
DS- To provide innovative, new gameplay and to draw in new gamers and hardcore gamers alike.
PSP- to provide the ultimate portable experience in terms of graphics, sound, and publicity.
ill take DS, seeing as how i have one ^.^
personally, I think SOny screwed themselves over when they made it so that the disk formatting is different on the PSP than normal DVDs and the PS2