It is on personal preference....i wudnt say to buy sony psp go,coz the reviews havent been good,tho i dint try it....mayb u can narrow ur choice b.w nintendo dsi n sony psp(Normal one,not "GO")....there is a wide choice of games,u can select any of it....

my personal preference is sony psp,bcoz i like SONY :P n the games r quite goood