I've yet to play FFIV-DS yet but from what I've been told, it makes quite nice use of the two screens. FFIII certainly wouldn't have been that much different with only one screen, certainly no worse, I don't think. World map was handy to have up, I'll concede, but it's not impossible to have a game without it present (FFI, for instance. As I own a DS and not a PSP, I'm quite content and biased for the games to be released for the DS. Though I do think it would be silly of designers not to make use of the two screens and the stylus while they're there.