Spots going fastBorealis vs Sirena
Side-by-side cruise ship comparison · Updated January 2026
Borealis is the significantly larger vessel at 63,458 GT — 110% more than Sirena's 30,277 GT. Sirena edges ahead in service with a passenger-to-crew ratio of 1.7:1, meaning more crew per guest. Borealis accommodates 676 more guests (1,360 vs 684), making it the larger resort-at-sea — Sirena trades capacity for a more intimate atmosphere.
Score: 6 – 1
Quick Compare
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Category
Borealis
Sirena
Size
63,458 GT
30,277 GT
Passengers
1,360
684
Year Built
2000
1999
Crew Ratio
1:2.2
1:1.7
Space Ratio
46.7
44.3
Decks
—
—
Length
238m
181m
From Price
—
$5,299/pp
Comparison Verdict
Borealis is the significantly larger vessel at 63,458 GT — 110% more than Sirena's 30,277 GT. Sirena edges ahead in service with a passenger-to-crew ratio of 1.7:1, meaning more crew per guest. Borealis accommodates 676 more guests (1,360 vs 684), making it the larger resort-at-sea — Sirena trades capacity for a more intimate atmosphere.
| Category | Winner |
|---|---|
| Size | Borealis |
| Capacity | Borealis |
| Modernity | Borealis |
| Service | Sirena |
| Spaciousness | Borealis |
| Decks | Tie |
| Length | Borealis |
| Fleet Power | Borealis |
Bottom line: Borealis leads 6–1 across our categories — strongest in Size. Choose Borealis for overall superiority; pick Sirena if its strengths matter more to you.
Which Ship Is Right for You?
Choose Borealis if...
- You want the newer ship (built 2000, 1yr newer)
- Size matters to you (63,458 GT)
- More onboard variety (1,360 guests)
- More space per guest (46.7 GT/pax)
You've compared the ships. Now see what they cost.
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Sailing Prices
| Borealis | Sirena | |
|---|---|---|
| Cheapest | — | $5,299 pp |
| Departing | — | Aug 17 |
| Duration | — | 10 nights |
| View Deal |
Prices from Cruisebound. We may earn a commission at no extra cost to you.
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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.
