I’ve sailed both Divina and Seashore, but only in the Yacht Club. We loved both ships. I highly recommended the YC. The extra price is paid back when you consider what the YC includes (Wi-Fi, drinks, etc), including a private pool for which there are always plenty of open loungers, and very few children. The Seashore is newer, and appears to have more open space, but beyond that I can’t recall specific differences. Enjoy!