How our Bliss Filters work
Detailed side-by-side comparison of Costa Cruises and Royal Caribbean cruise ships
| Specification | Costa Diadema | Oasis of the Seas |
|---|---|---|
| Cruise Line | Costa Cruises | Royal Caribbean |
| Maiden Voyage | 2012 | 2008 |
| Year Refurbished | N/A | 2019 |
| Adults Only | No | No |
| Specification | Costa Diadema | Oasis of the Seas |
|---|---|---|
| Passenger Capacity | 4,947 | 5,400 |
| Crew Size | 1,253 | 2,394 |
| Guest-to-Crew Ratio | 3.95 | 2.26 |
| Specification | Costa Diadema | Oasis of the Seas |
|---|---|---|
| Gross Tonnage | 132,500 | 225,282 |
| Length | 1,004 ft | 1,187 ft |
| Width | 122 ft | 198 ft |
| Ship Size Category | Mega | Mega |
| Number of Decks | 20 | 16 |
| Specification | Costa Diadema | Oasis of the Seas |
|---|---|---|
| Overall Cruiseable Rating | 8.0 / 10 | 9.0 / 10 |
| Roominess Score | N/A | 35.6 |
| Advised For | Families, entertainment | Party, staterooms, families, entertainment |
