Sun Princess vs Celebrity Ascent 2026: Which Premium Ship?

Both of these ships represent their line’s most current thinking about premium cruising, and both launched within a year of each other. But Sun Princess and Celebrity Ascent arrived at “premium” from different directions, and that gap is wider than their launch dates suggest.

One is a clean-sheet design. The other is the polished latest version of a formula that is now several years old. That distinction shapes almost everything below.

Two takes on premium

Sun Princess is the first ship in Princess’s new Sphere class, a genuine reset for the line at 177,882 GT. It is built to feel modern and broad: refined enough for couples, but with Park19 and a 4,300-guest capacity that comfortably absorbs families.

Celebrity Ascent is the fourth Edge-class ship, sharing the stretched hull and extra deck of Celebrity Beyond. Celebrity positions a notch more upscale than Princess, and Ascent shows it in the dining roster and the adults-leaning atmosphere. The catch is that the underlying design debuted on Celebrity Edge back in 2018; Ascent refines it rather than reinvents it.

Newness versus a refined formula

This is the crux. If you value the latest design language, Sun Princess wins on novelty: The Dome, the reimagined Piazza, completely redesigned cabins with glass shower doors and better storage, and a layout no Princess guest has sailed before 2024.

If you value a formula that has been sanded smooth over four ships, Ascent wins. Edge-class quirks have been worked out, the Grand Plaza was enlarged with the Martini Bar repositioned to the center, and the new AquaClass SkySuites add a wellness tier that did not exist on the original Edge. You are choosing between fresh and proven.

The signature spaces

Each ship has one space worth booking for. On Sun Princess it is The Dome, the first fully glazed geodesic dome on a cruise ship, a Santorini-inspired pool deck by day and a Cirque Eloize stage by night. There is nothing like it at sea, and it anchors the ship’s identity.

On Celebrity Ascent the equivalent is the Rooftop Garden with its two cantilevered floating pools that extend six feet past the hull, plus the three-deck Eden lounge. They are quieter, more design-driven moments rather than a single headline venue, which fits Ascent’s more grown-up tone.

Families have a clear pick; couples might not

For families, this comparison is not close. Sun Princess has Park19, the Rollglider, the splash aquapark, and the capacity and programming to keep kids and teens busy. Ascent has no dedicated family zone and is happiest with an adult crowd.

For couples, it genuinely splits. If you want fine dining and a refined, lower-key adult atmosphere, Ascent’s Le Voyage and AquaClass SkySuites make a strong case. If you want a brand-new ship with a wow factor and more variety, Sun Princess does. That is the one segment where I would not argue hard either way.

Cabins and suites

The cabin tiers run close in the middle and diverge at the extremes. Interiors start at 136 sq ft on Sun Princess and 142 sq ft on Ascent, and both sit around 200 sq ft for standard balconies. At the top, Celebrity pulls ahead: Ascent’s suites reach 1,892 sq ft versus 1,118 sq ft on Sun Princess. Sun Princess answers with quantity, more than 80 suites across seven categories, including two-bedroom Sky Suites for families who want suite space without a single enormous room.

The verdict

For most travelers, book Sun Princess. It is newer, larger, more versatile across family and couple travel, and The Dome gives it a signature nothing on Ascent matches. As an all-around modern premium ship, it is the safer recommendation.

Book Celebrity Ascent if you are a couple or a foodie who wants the more upscale experience, the deeper specialty-dining bench led by Le Voyage, and the wellness-focused AquaClass SkySuites. Compare a specific Princess sailing against a Celebrity one, because on these two ships the dining program and onboard atmosphere will matter more to your week than the tonnage gap.