IMO, both systems have a couple of good games that are worth buying. i have a PSP and just got Me and My Katamari and i cant put it down.

then again, my brother has a DS with Mario Kart DS and thats just as fun.

so in the end, i suggest heading on over to gamespot.com and check out both systems and see what kind of games appeal to you more.

on a side note, i'll be picking up a DS for Metroid, Zelda and Mario Kart sometime in the future.