The Paradox is definitely smoother in back as it reads more in the mids. Don't make any mistake though- the Paradox is a very strong ball and can handle heavy/flat patterns easily. It also handles surface changes nicely and the cover seems to be holding up well.
The Critical as others have said tends to save more for the back and will be a little more angular. Without having seen it in person, I would guess it gets another 1-2 feet downlane based on its cover/core match. But both balls would offer good continuation.