Which do you think is a better gaming device PSP or NDS  

I was wondering what do you people think about the gaming devices? Which one do you like better NDS or PSP. Although PSP is cheap it got very high graphics and tthe games are much challenging in it. But NDS on the other hand gives a different way of playing. It has this 2 screen and one is touch. As far as I can say PSP is for those who love Good Graphics, Challenge and mostly violent games and NDS are for those who like to play Relaxing games, New ways og gaming and mostly Non-violent Calming games. Do share what you opinions are about this.