Well i really hate the whole entire Nintendo company(which of course includes the DS)because they make games for kids and family,but i really dont have a PSP(but i have used it several times)to say something good about it,soooo....PSP.
PSP is old news. The nintendo DS implements a touch screen that introduces a unique way to play games and overall makes gaming more enjoyable. Plus, when comparing sales, the DS dwarfs PSP sales, in systems and games.