We were there on oasis at the same time as ovation. It was fine, although it got busier late morning/ early afternoon, there were still loungers available, didn’t have to wait for food or bar service and managed to get a spot at the swim up bar at south beach. We didn’t go to the pool, so don’t know how busy that was.
One thing with 3 ships, the third ship would have to tender as the pier only takes 2. The extra visitors would more
likely come from Icon visiting at the same time as an oasis class than from 3 ships.