Personally, I've found the mini velo style to be the most 'road bike' like.

The BF pocket rocket pro impresses me for its lean geometry and weight and perhaps I'd rate it as one of the fastest foldable bikes one can own.
Folding part of it isn't that good imo, almost like a 'breakable' bike than a true fold and carry/push around bike to me.

That said, it really boils down to the engine.
I certainly believe that once one gets past the usual stumbling blocks to speed on the bike side of things (fit, geometry, good stiffness, decent parts, decent wheels), the difference is slight and rider dependent.