I had a dahon curve d3 for almost 4 years, and now i'm a proud owner of a brompton s2l. Both 16" cause the main use is commuting by train. Daily total distance of 12km.
So if a 16" fits your use (small fold, no long touring distances) and you are willing to spend some extra money, go with the brompton. The s type doesn't flex, the 2speed picks up speed really easy and quick. I like the brompton clamps much better, cause the dahon clamps failed at the end, don't see that happen with the simple bromton design.
A larger folder could be better, depending on your use