PSP was the better hardware by far. I still say the dual screens is a stupid design, just do one screen! Everybody only ever looked at the top screen unless there was some dumb gimmick that made you try and hold a stylus and push buttons at the same time... however, the DS was by far the better supported system with games so it wins, even though it is a stupid design...
Nah, the bottom screen was where developers put all the UI icons. This uncluttered the main screen, which needed to be uncluttered to see what was going on, on such a small screen.