In comparing just the ships, I would pick Seaside. The NCL Epic is older (2010) and the Seaside has the bonus of being brand new. One major complaint people have about the Epic is the bathroom configuration in the cabins, especially if you are travelling with someone who is not your significant other. The Epic cabins have an open-bathroom floorplan; when you walk into the cabin, the toilet area is to the left and the shower is on the right (or vice versa)- both only have a frosted sliding door separating them from the cabin, meaning anyone in the cabin can somewhat see, hear, and smell what is happening :o. I think there may be a curtain that you can pull to close off the "bathroom" area. Also, the sink is actually in the cabin area, so you are limited on the usual bathroom shelving/storage space.