For me, it's the DS. From what I've played of each (PSP and DS... haven't seen a Gizmundo), I prefered the DS's touch screen to the better graphics of the PSP. I played Metal Gear Ac!d for the PSP and Kirby: Canvas Curse for the DS, and I honestly had more fun with the DS. Also, since I don't really care about UMD movies, music, or basically any other extra the PSP provideds, uhhh, yeah. But that's my little opinion.