well both are awsome. My brother has a DS and I have a PSP. I like the DS for the touch screen and Guitar Hero. But I love listing to music. I think the DS has better Quality and some good games. The PSP I think is way better because of the games, the music, and the way you can store pictures
PSP I don't know if i could survive without my PSP. I never play the games but the music video and internet are great and I refuse to use an ipod as I hate them. So it's my only source of portable musical joy
PSP for sure, with games like Wipeout Pulse and God Of War: CoO. PSP just seems more entertaining to me, plus DS seems low quality. Mine has a broken L button, cracked hinge, scratched screen, and I've only dropped it once. My PSP has been dropped like 5 times in the past month and it's still like new.