I'd say the Swift, the dropouts, standardization!, price? as well as the stability of the frame are just cooler.
Unless you are likely to do a lot of Multi Mode commuting, then the better fold of the Dahon may be a real asset.
Many Props to Dahon for the examples of great service, but it still reeks that they engage in non standardization IMO. Oh well.
I couldn't interest you in a Downtube by chance could i?! (I joke! I joke!)