If you're a serious racer then the round, thicker may be for you. If you like to cruise and never have to take your hands off the wheel to change a station or change the scale on your navigational system, or answer the phone,--try the multifunctional. (I have the latter).
I orderd the MF and the thicker. The MF was $250 plus the $930 for the thicker. Hopefully thicker is worth the $930 extra. They will through in the dbl stiching Hopefully it is worthed. We shall see.