I'd have to vote for the DS.
I love Nintendo,
and even though you can do a lot of spiffy things with the PSP,
I'd only need it for the gaming aspect of it.
PSP has better 3-D games and more detailed games,
but it's so tiny.
If I want to play a game that that's detailed,
I want to be able to play it on a huge screen,
not on a handheld.
PSP doesn't have AC:WW either.
T_T
DS = Win