It's not even close in my mind. The DS whipes the floor with the PSP. The games are much better, and really if you own a PS2 than the PSP is not going to offer you anything you can't get on a console, and in almost all cases it plays better on the PS2. The DS offers so much inovation and originality, and it kills the PSP when it comes to pick up and play games that are important for handhelds to have. Also expect the DS to have a longer life of first and third party support with how sales are going.