Spots going fastCosta Diadema vs World Dream
Side-by-side cruise ship comparison · Updated February 2026
World Dream is the larger vessel at 151,300 GT — 14% more than Costa Diadema's 132,500 GT. World Dream offers more personal space with a space ratio of 44.5 GT per passenger versus 35.6. Built in 2017, World Dream is 3 years newer — an advantage for travellers seeking modern amenities and design.
Score: 0 – 7
Quick Compare
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Category
Costa Diadema
World Dream
Size
132,500 GT
151,300 GT
Passengers
3,724
3,400
Year Built
2014
2017
Crew Ratio
1:3.0
1:1.7
Space Ratio
35.6
44.5
Decks
—
—
Length
306m
335m
From Price
$1,997/pp
—
Comparison Verdict
World Dream is the larger vessel at 151,300 GT — 14% more than Costa Diadema's 132,500 GT. World Dream offers more personal space with a space ratio of 44.5 GT per passenger versus 35.6. Built in 2017, World Dream is 3 years newer — an advantage for travellers seeking modern amenities and design.
| Category | Winner |
|---|---|
| Size | World Dream |
| Capacity | World Dream |
| Modernity | World Dream |
| Service | World Dream |
| Spaciousness | World Dream |
| Decks | Tie |
| Length | World Dream |
| Fleet Power | World Dream |
Bottom line: World Dream leads 7–0 across our categories — strongest in Size. Choose World Dream for overall superiority; pick Costa Diadema if its strengths matter more to you.
Which Ship Is Right for You?
Choose World Dream if...
- You want the newer ship (built 2017, 3yr newer)
- Size matters to you (151,300 GT)
- Better service ratio (1.7:1 crew ratio)
- More space per guest (44.5 GT/pax)
You've compared the ships. Now see what they cost.
See Current Prices
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Sailing Prices
| Costa Diadema | World Dream | |
|---|---|---|
| Cheapest | $1,997 pp | — |
| Departing | Jul 31 | — |
| Duration | 7 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.
