If you hollow the rooms out to an empty shell, they are the same. It all comes down to decoration. YC is more navy blue, gold, and red with nautical touches, and a boat/anchor motif. BC is pale grays and blues, fish/seashell motif.
Now, I will say, BC just underwent a GORGEOUS renovation. So, while my preference is YC, I will admit that currently, those rooms won't feel as "fresh" as those at BC, but they are still lovely, and there are many recent reports of them being just fine, just not as recently updated. If you check the BC/YC thread on this board, you'll meet some very friendly people and can see lots of pics on the first page.