I own both brands, 05 models. The OP is comparing a Dahon (that costs twice as much as the DT FS) with the DT FS: that's a message in itself. My advice is... standard upgrade paths mean ALOT. IMO, the DT FS alu frame and full sus is a better frame and sus than anything Dahon offers. If you enjoy wrench time, the answer is clear. If you want something with better componentry out of the box, and don't care about upgrade paths, the Speed P8.