To be honest I'm not for or against either.
Usually when stuff like this is brought up, i.e. Xbox360 VS PS3, the pro PS3 side doesn't own an Xbox360, and vice versa for 360 owners.
And usually when I read articles about this stuff there is never really a good point brought up that make either one look good, it just basically goes "I think PS3 is the sex just because" and "Xbox is just better"
But I digress
PSP is better in terms of extras like internet capability, mp3, movies, etc.
But the DS gets props for dual screens. Now most DS owners know, and most people that played the one on display at target or walmart or where ever will say "well the second screen is usually just a map or some kind of Heads Up Display, and i would normally agree. However recently a game came out called, "The World Ends With You" in which you play two different characters at the same time using the stylis to control the bottom screen, and the D-Pad to control the character on the top screen. as long as nintendo comes out with interesting gameplay ideas such as this the DS will never truly lose in the "WHICH ONE IS BETTER???" battle.