Side-by-side cruise ship comparison · Updated January 2026
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across 5 categories
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)
Mariner of the Seas
Spectrum of the Seas
Gross Tonnage
Mariner of the Seas
139,863 GT
Spectrum of the Seas
169,379 GT
Length
Mariner of the Seas
311 m
Spectrum of the Seas
347 m
Beam
Mariner of the Seas
48 m
Spectrum of the Seas
41 m
Passengers
Mariner of the Seas
3,807
Spectrum of the Seas
4,246
Crew
Mariner of the Seas
1,185
Spectrum of the Seas
1,551
Decks
Mariner of the Seas
—
Spectrum of the Seas
—
Year Built
Mariner of the Seas
2,003
Spectrum of the Seas
2,019
Space Ratio
Mariner of the Seas
36.7 GT/pax
Spectrum of the Seas
39.9 GT/pax
Passenger:Crew Ratio
Mariner of the Seas
3.21 :1
Spectrum of the Seas
2.74 :1
| Specification | Mariner of the Seas | Spectrum of the Seas |
|---|---|---|
| Overview | ||
| Cruise Line | Royal Caribbean International | Royal Caribbean International |
| Class | Voyager Class | Quantum Ultra Class |
| Status | active | active |
| Year Built | 2,003 | 2,019Winner |
| Dimensions | ||
| Gross Tonnage | 139,863 GT | 169,379 GTWinner |
| Length | 311 m | 347 mWinner |
| Beam | 48 mWinner | |
| Capacity | ||
| Passengers | 3,807 | 4,246Winner |
| Crew | 1,185 | 1,551Winner |
| Key Ratios | ||
| Space Ratio | 36.7 GT/pax | 39.9 GT/paxWinner |
| Passenger:Crew Ratio | 3.21:1 | 2.74:1Winner |
| Build | ||
| Builder | Kvaerner Masa-Yards | Meyer Werft |
| Flag | Bahamas | Bahamas |
| IMO Number | 9227510 | 9778856 |
Spectrum of the Seas is the significantly larger vessel at 169,379 GT — 21% more than Mariner of the Seas's 139,863 GT. Built in 2019, Spectrum of the Seas is 16 years newer — an advantage for travellers seeking modern amenities and design. Spectrum of the Seas edges ahead in service with a passenger-to-crew ratio of 2.7:1, meaning more crew per guest.
| Category | Winner |
|---|---|
| Size | Spectrum of the Seas |
| Capacity | Spectrum of the Seas |
| Modernity | Spectrum of the Seas |
| Service | Spectrum of the Seas |
| Spaciousness | Spectrum of the Seas |
Bottom line: Spectrum of the Seas wins more categories (5 vs 0), making it the stronger all-round choice based on current data.
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
Spectrum of the Seas
Built in 2019 with modern facilities — great for a first cruise
Large 4,246-guest capacity offers competitive pricing
4,246 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
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41 m |
| Draft | 9.3 mWinner | 8.9 m |
| Decks | — | — |
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