guys!!! the PSP is the best u can surf the internet, install custom firmware,WAY BETTER GRAPHICS, plus theres a new PSP coming out its called the PSP GO if you think that the ds LITE (the lite one sucks) is cool JUST WAIT!!! (the also making a camera for it too, but its only available in japan right now...)
theres a file on the PSP thats called DaedalusX64 it has alot of games that come from the nitendo 64... to see this file u have to look on ur PSP internal memory (by a computer) only thing is though..... u have to have a hacked PSP to play those games...games include mario kart, 007 goldeneye, madden, all those kinds of games
Both are basically diffrent psp hails to more of a hardcore audience and DS is basically for the nintendo fans and casual gamers. Basically a matter of preference.