Well, if I'm in the car with no one, PSP for sure but if my brother brings his DS, we always play Mario or Mario Kart, DS. Also, if I get the Final Fantasies on DS, totally DS.
HAha DS wins in a landslide.......... I happen to be playing on my way home from school, some girl bikes past and said to me PSP is better..... I sald to my friend "sssshhh, she wishes they were better". lmao.. but DS for me