I prefer a DS, the battery life lasts a lot longer than the PSP. The PSP can play movies, but it can barely go through 1 movie without being charged. The DS can survive getting dropped, stepped on, and flushed down the toilet. The PSP can't survive getting stepped on. The DS is aimed towards games, while the PSP is more of a media thingy. I read a poll that more people are satisfired with their DS and PSP, and that the DS sells more.