Size
Based on gross tonnage and length
Capacity
Based on passengers and crew
Modernity
Based on year built
Service
Based on passenger-to-crew ratio (lower is better)
Spaciousness
Based on gross tonnage per passenger (higher is better)
AIDACosma
Mariner of the Seas
Gross Tonnage
AIDACosma
183,858 GT
Mariner of the Seas
139,863 GT
Length
AIDACosma
337 m
Mariner of the Seas
311 m
Beam
AIDACosma
42 m
Mariner of the Seas
48 m
Passengers
AIDACosma
5,200
Mariner of the Seas
3,807
Crew
AIDACosma
1,550
Mariner of the Seas
1,185
Decks
AIDACosma
—
Mariner of the Seas
—
Year Built
AIDACosma
2,022
Mariner of the Seas
2,003
Space Ratio
AIDACosma
35.4 GT/pax
Mariner of the Seas
36.7 GT/pax
Passenger:Crew Ratio
AIDACosma
3.35 :1
Mariner of the Seas
3.21 :1
| Specification | AIDACosma | Mariner of the Seas |
|---|---|---|
| Overview | ||
| Cruise Line | AIDA Cruises | Royal Caribbean International |
| Class | Helios Class | Voyager Class |
| Status | active | active |
| Year Built | 2,022Winner | 2,003 |
| Dimensions | ||
| Gross Tonnage | 183,858 GTWinner | 139,863 GT |
| Length | 337 mWinner | 311 m |
| Beam | 42 m | 48 mWinner |
| Capacity | ||
| Passengers | 5,200Winner | 3,807 |
| Crew | 1,550Winner | 1,185 |
| Key Ratios | ||
| Space Ratio | 35.4 GT/pax | 36.7 GT/paxWinner |
| Passenger:Crew Ratio | 3.35:1 | 3.21:1Winner |
| Build | ||
| Builder | Meyer Werft | Kvaerner Masa-Yards |
| Flag | Italy | Bahamas |
| IMO Number | 9781865 | 9227510 |
AIDACosma is the significantly larger vessel at 183,858 GT — 31% more than Mariner of the Seas's 139,863 GT. Built in 2022, AIDACosma is 19 years newer — an advantage for travellers seeking modern amenities and design. Mariner of the Seas edges ahead in service with a passenger-to-crew ratio of 3.2:1, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | AIDACosma |
| Capacity | AIDACosma |
| Modernity | AIDACosma |
| Service | Mariner of the Seas |
| Spaciousness | Mariner of the Seas |
Bottom line: AIDACosma wins more categories (3 vs 2), making it the stronger all-round choice based on current data.
AIDACosma
Large 5,200-guest capacity offers competitive pricing
5,200 passengers means tons of activities
Built in 2022 with modern facilities — great for a first cruise
Comfortable atmosphere for two
Mariner of the Seas
Large 3,807-guest capacity offers competitive pricing
Well-suited for cruise newcomers
3,807 passengers means tons of activities
Comfortable atmosphere for two
Free cancellation on most rooms
Bundle & save on your cruise trip
Medical, trip cancellation & luggage cover
We may earn a commission from partner bookings at no extra cost to you.
| Draft | 8.6 m | 9.3 mWinner |
| Decks | — | — |
