I've stayed in the one story BW Grand Villa and toured the one as SSR .
SSR is two levels, has a very elegant but small living room(compared to more casual large BWV one) . The kitchen is more like regular one bedroom size with granite countertops,top of theline cabinets...very pretty. The BWV kitchen is more open less elegant, part of the dining room, living room greatroom. SSR has a private dining room which faced away from DTD and had a small balcony . Bedrooms were all comparable in size but SSR were abit more upscale in furnishings.
The big difference for me is that the Board walk Grand Villas all have several large balconies overlooking the boardwalk which is a major draw for me. I don't care for the outside cement corridors as I've stated before at SSR and I prefer valet parking and being in the middle of the action at BW.
However, you will easily impress any family members if you treat them to any grand villa...they are all beautiful with different plusses and minuses. OKW look gorgeous from the pictures. I hope I helped alittle.