DS games are way better than PSP games.. I'm an owner of
both...
If you already own a portable video player or a MP3 player and
you got no interest in watching videos on the go, DS is a much
better choice unless :
-When playing games, you go for graphics, not for gameplay
-You prefer your game to be played with better music.
-You'll like to be able to modify your system in many other
ways.
PSP games are dying.. none of them are innovative at all. The
release are slow and rather dissapointing.. But you get to install
emulators, or modify them to do many other stuffs, in which DS is
not capable of.
So if you're looking for a gaming console ONLY, I suggest you
get a DS.
All the best.
we have metal gear solid, crisis core and monster
hunter......which i think are one of the best games for psp both
graphics wise and gameplay wise