I guess I would have to repeat what everyone here has said. It depends on what you want to do with the bike. I don't have a folder yet, but I plan on getting one soon. I will probably go with the brompton because it folds the smallest. I have other bikes, and will use those mostly... so having the most compact would be the primary issue for me... I am not going to take it on long rides, so if I can pedal with it for 30 minutes, it's ok...
Primary usage for me would be to take on the TGV train when I go to Paris a few times per month.