No comparison. While you might be fine on a Dahon on short rides (I used to have one), longer rides will likely be a different story. I ride my Bike Friday Pocket Rocket Pro for longer club rides, organized rides, and multiple-day supported tours. I can't say enough good things about the bike. I also have a Luna and it's a hard to decide which bike to ride. It took me a year to pay for my Bike Friday, but I am so glad I have it.

(hi Lynette! 2009 PAC Tour white PRP here!)