Well, im in doubt which one i buy.
I love sony, dont like too much nintendo. But, psp had to buy a lot of other stuff to work correctly, like memory stick pro duo, bag, etc. And games are kinda expensive.
Then, DS runs Game Boy old games( i got some GB and GBC games here XD) and then, the multi-player games just one DS needs to have the game and everyone plays. PSP, both have to have the game T_T
SO, i picked PSP but im still thinking :S