The Wonder of the Seas is considered a n extra large size ship. It's 19 years newer than the Mariner of the Seas, which was built in 2003 and renovated in 2018. The Wonder of the Seas is the largest cruise ship in the world and has quite a few upgrades from its Oasis-class siblings such as a new suite neighborhood, an outdoor bar called The Vue, and an outdoor kid's play area.
The Royal Caribbean Wonder of the Seas is a fairly new ship, being built in 2022.