TWEWY is not that overrated until you've finished the main story, after that it IS overrated...
Some DS-worthy titles like Professor Layton and the upcoming Okamiden and Scribblenauts, along with good titles like the nostalgic Chrono Trigger DS and kinda new Viva Pinata gives some point for DS
But then PSP's got War of the Lions, Crisis Core, Agito, Chains of Olympus, Vice City Stories, Liberty City Stories, Dissidia, and those alone are enough to lure you
in the end, just buy both of them
There's no reason to say "PSP's music playback capability is heavenly!" My Nokia handles that nicely. You gotta admit it's good, but it's not like it's so HEAVENLY. More options is always welcome though....
There's no reason to say "DS's video playback is a joke", it's a fucking game console, not media player
There's no reason to say "DS is for kids" kids won't play Brain titles, they'll take games instead
There's no reason to say "PSP is for the proud adults" what the fuck is Bomberman doing there?
There's no reaosn to say "DS is weak!" gameplay is everything, not graphics
There's no reason to say "PSP is powerful!" Kingdom Hearts for DS proved DS is quite worthy visual-side
There's no reason to say "DS got a fucking extra screen!" PSP got a widescreen
There's no reason to say "PSP got an analog controller!" DS got the touching capability
There's no reason to say "DS got bad games" DS got Mario Kart DS and Professor Layton
There's no reason to say "PSP got great games" PSP doesn't have alot of games, however, lots of those are good