Spots going fast5 Night Western Caribbean Cruise
Royal Caribbean • Mariner of the Seas
Sep 14, 2026 · 5 nights
Caribbean
$329/person$66/night
View Deal →Mariner of the Seas vs Spectrum of the Seas
Side-by-side cruise ship comparison · Updated April 2026
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.
Score: 0 – 7
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Category
Mariner of the Seas
Spectrum of the Seas
Size
139,863 GT
169,379 GT
Passengers
3,807
4,246
Year Built
2003
2019
Crew Ratio
1:3.2
1:2.7
Space Ratio
36.7
39.9
Decks
—
—
Length
311m
347m
From Price
$328.94/pp
$692/pp
Comparison Verdict
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 |
| Decks | Tie |
| Length | Spectrum of the Seas |
| Fleet Power | Spectrum of the Seas |
Bottom line: Spectrum of the Seas leads 7–0 across our categories, strongest in Size. Choose Spectrum of the Seas for overall superiority; pick Mariner of the Seas if its strengths matter more to you.
Which Ship Is Right for You?
Choose Spectrum of the Seas if...
- You want the newer ship (built 2019, 16yr newer)
- Size matters to you (169,379 GT)
- More onboard variety (4,246 guests)
- Better service ratio (2.7:1 crew ratio)
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Deep Dive
Upcoming Sailings
Upcoming Sailings on Mariner of the Seas
Spots going fast
Leaves in 8 days5 Night Western Caribbean Cruise
Royal Caribbean • Mariner of the Seas
Sep 19, 2026 · 5 nights
Caribbean
$398/person$80/night
View Deal →
Leaves in 13 days$2,219/person$555/night
View Deal →Upcoming Sailings on Spectrum of the Seas
Leaves in 8 days$692/person$173/night
View Deal →
Leaves in 12 days4 Night Busan Cruise
Royal Caribbean • Spectrum of the Seas
Sep 23, 2026 · 4 nights
Asia & Indian Ocean
$718/person$180/night
View Deal →
Leaves in 16 days$718/person$180/night
View Deal →Hotels & Accommodations Near Miami Cruise Port
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Frequently Asked Questions
How is the comparison score calculated?
We compute scores across 8 categories using real spec data: gross tonnage, passenger capacity, crew capacity, year built, length, deck count, space ratio, and fleet power. Each category awards one point to the winning ship.
What is the space ratio and why does it matter?
Space ratio is gross tonnage divided by passenger capacity. A higher number means more space per guest. Luxury lines typically score above 40; mass-market ships often fall in the 30-40 range.
What does the passenger-to-crew ratio mean?
Passengers per crew member. Lower is better, more staff per guest means better service. Luxury lines aim below 2:1; large mainstream ships may be 3-4:1.
Are the prices shown accurate?
Prices are sourced from Cruisebound and reflect real-time availability. They may change based on cabin type, date, and demand. Click through to see the latest fares.
Can I compare more than two ships?
Yes, up to four ships. Use the search tool on the compare hub page to add additional ships.
How current is the ship data?
Specifications come from our database of 380+ vessels, revalidated every 5 minutes via ISR. The "Updated" timestamp shows when records were last modified.
