Stack n whack and OBW are basically two different looks.....at least I think so.....SnW controls the hex by adding corners and thus giving space between each Swirl whereas OBW is just one hex after another all different...I prefer the look of SnW..one can see the different designs one fabric can make...and I think easier to put together......I have done both.....albeit they were small, but SnW is much easier to work...JMHO