Here, lemme make it easy for you.

The fold on the Curve is excellent; fold on the Swift sucks. However, in many ways the Swift rides like a high-quality hybrid, and in that respect will beat the snot out of most $700-or-less folders.

So if you need a small fold, and ride quality isn't all that important, go for the Curve SL. If fold size is completely irrelevant, and ride quality is at a premium, Swift.