The difference is mainly in the colors and theming. YC has darker, richer colors and is themed more nautical whereas BC is more pastel colors and seashells.
Also, and this is a biggie...all rooms at YC have balcony's. BC has alot of standing room only balcony's - a platform big enough for 1 person to stand on. There are only a limited amount of real balcony's at BC so if the balcony thing is important to you, you may want to go for YC for that reason alone.
Beyond that, I've stayed at Both and Both are wonderful
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