Galaxy S26 Ultra vs vivo X300 Ultra
If you’re shopping for a phone in the flagship smartphone class, the Galaxy S26 Ultra and the vivo X300 Ultra are likely both on your shortlist. If you only read one line, make it this: the vivo X300 Ultra takes 1 of 4 compared areas, and the battery & charging gap is the one to look at first.
At a glance
- Performance Tie
- Memory & Storage Tie
- Camera Galaxy S26 Ultra wins
- Battery & Charging vivo X300 Ultra wins
- Memory & Storage4.5
- Camera10.0
- Battery & Charging3.7
- Memory & Storage4.5
- Camera8.9
- Battery & Charging8.0
Spec scores (0 to 10) are calculated from manufacturer specs against other models in the same class. See how the formula works. They are not reviews or user ratings.
Key Differences
-
The vivo X300 Ultra has 32% more battery capacity
This is one of the widest gaps in the whole comparison: 6,600 mAh for the vivo X300 Ultra versus 5,000 mAh for the Galaxy S26 Ultra. Capacity isn’t everything, but when two phones are otherwise close, more milliamp-hours is the simplest endurance advantage there is.
-
The vivo X300 Ultra has faster 100 W wired charging
The Galaxy S26 Ultra lists 60 W; the vivo X300 Ultra comes in at 100 W. That’s not a rounding error. Peak charging speeds depend on a compatible charger, which may not come in the box.
-
The Galaxy S26 Ultra has an extra rear camera
At 4 versus 3, this is a decisive lead for the Galaxy S26 Ultra, the kind of difference you notice without looking for it. An extra rear camera usually means another focal length (ultra-wide, telephoto or macro) and more freedom in framing.
-
The vivo X300 Ultra has a tougher IP68/IP69 rating
It’s a fine margin, and it favors the vivo X300 Ultra (IP68/IP69 versus IP68). The vivo X300 Ultra’s tougher rating doesn’t make it waterproof, but it offers more protection when accidents happen.
Design & Size
Both come in at nearly the same overall dimensions, so pick on other grounds.
Design & Build
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Height | N/A (not specified) | 6.42 in |
| Width | N/A (not specified) | 3.02 in |
| Thickness | N/A (not specified) | 0.32 in |
| Weight | N/A (not specified) | 8.18 oz |
| Water & dust rating | IP68 | IP68/IP69 (winner) |
| Frame | N/A (not specified) | Aluminum |
Display
The display entries below are descriptive rather than numeric. Read them side by side to see where the Galaxy S26 Ultra and the vivo X300 Ultra part ways.
Performance
Too close to call
Both the Galaxy S26 Ultra and the vivo X300 Ultra cover performance equally well on paper. The takeaway: performance is not where these two differ.
Memory & Storage
Too close to call
On paper, the memory & storage comparison ends all square. Bottom line for memory & storage: it’s a wash.
Camera
Galaxy S26 Ultra leads
If you’re keeping score, the camera point goes narrowly to the Galaxy S26 Ultra. The Galaxy S26 Ultra comes with an extra rear camera. More cameras help most when each covers a different view, so check the table to see what the Galaxy S26 Ultra’s extra lens adds. If camera is your priority, the Galaxy S26 Ultra is the phone to pick.
Rear cameras
Galaxy S26 Ultra: 4 vivo X300 Ultra: 3 The count alone doesn’t guarantee quality, but the Galaxy S26 Ultra gives you more lenses to choose from.
Battery & Charging
vivo X300 Ultra leads
In the battery & charging category, the vivo X300 Ultra isn’t just ahead; it’s clearly ahead. The vivo X300 Ultra steps ahead thanks to 32% more battery capacity. A bigger battery usually means longer days between charges, although chip efficiency and screen size also shape real endurance. Net result: the vivo X300 Ultra leads this part of the comparison.
Battery capacity
Galaxy S26 Ultra: 5,000 mAh vivo X300 Ultra: 6,600 mAh Extra capacity also ages better: after a few years of charge cycles, the vivo X300 Ultra has more headroom left.
Wired charging
Galaxy S26 Ultra: 60 W vivo X300 Ultra: 100 W The vivo X300 Ultra refills faster on a cable, which matters most on the mornings you forgot to charge overnight.
Software & Updates
Names, not numbers: the software & updates rows below show what each one is built with, and it’s worth reading them side by side.
Full Specifications
Display
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Screen size | 6.9 in | 6.8 in |
| Panel type | Dynamic AMOLED 2X | LTPO AMOLED |
| Resolution | 3120 x 1440 | 3168 x 1440 |
| Refresh rate | N/A (not specified) | 144 Hz |
| Always-on display | Yes | N/A (not specified) |
Performance
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Chipset | Snapdragon 8 Elite Gen 5 for Galaxy | Snapdragon 8 Elite Gen 5 |
| CPU cores | N/A (not specified) | 8 |
| Process node | N/A (not specified) | 3 nm |
| RAM | 12 GB | 12 GB |
Memory & Storage
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Base storage | 256 GB | 256 GB |
| Max storage | 1 TB | 1 TB |
| microSD slot | No | No |
Camera
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Main camera | 200 MP | 200 MP |
| Ultra-wide camera | N/A (not specified) | 50 MP |
| Telephoto camera | N/A (not specified) | 200 MP |
| Optical zoom | N/A (not specified) | 3.7× |
| Rear cameras | 4 (winner) | 3 |
| Front camera | N/A (not specified) | 50 MP |
| Max video | N/A (not specified) | 8K30 |
Battery & Charging
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Battery capacity | 5,000 mAh | 6,600 mAh (winner) |
| Wired charging | 60 W | 100 W (winner) |
| Wireless charging | N/A (not specified) | 40 W |
| Port | USB-C | USB-C (USB 3.2) |
Software & Updates
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| OS at launch | Android 16 (One UI 8.5) | OriginOS 6 (Android 16) |
| Promised OS updatesManufacturer commitment | 7 years | N/A (not specified) |
Design & Build
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Height | N/A (not specified) | 6.42 in |
| Width | N/A (not specified) | 3.02 in |
| Thickness | N/A (not specified) | 0.32 in |
| Weight | N/A (not specified) | 8.18 oz |
| Water & dust rating | IP68 | IP68/IP69 (winner) |
| Frame | N/A (not specified) | Aluminum |
Price
| Spec | Galaxy S26 Ultra | vivo X300 Ultra |
|---|---|---|
| Launch price | $1,300 | N/A (not specified) |
“N/A” means the manufacturer does not specify the value or we could not confirm it. Figures marked “manufacturer rating” are the maker’s own claims, not our measurements.
Which One Should You Buy?
Choose the Galaxy S26 Ultra if…
- you want more lenses to choose from (4 vs 3 rear cameras)
- you’re comfortable with how Samsung does things
Choose the vivo X300 Ultra if…
- you want the bigger battery (6,600 mAh vs 5,000 mAh)
- you often need a quick top-up before heading out (100 W vs 60 W wired)
- you want better protection against water and dust (IP68/IP69 vs IP68)
Also Compared
Frequently Asked Questions
Which is better for most people, the Galaxy S26 Ultra or the vivo X300 Ultra?
The vivo X300 Ultra makes more sense overall. Consider the alternative only if your top priority is an extra rear camera.
Which has better battery life, the Galaxy S26 Ultra or the vivo X300 Ultra?
The vivo X300 Ultra comes out ahead on battery capacity, with 6,600 mAh compared with 5,000 mAh on the Galaxy S26 Ultra.
Is the Galaxy S26 Ultra bigger than the vivo X300 Ultra?
The Galaxy S26 Ultra and the vivo X300 Ultra are so close in size that you’d struggle to tell them apart on dimensions alone.
Which has the better camera, the Galaxy S26 Ultra or the vivo X300 Ultra?
Going by the hardware, the Galaxy S26 Ultra comes out ahead: an extra rear camera.
Executive Summary
Brand loyalty aside, I tried to judge the Galaxy S26 Ultra and the vivo X300 Ultra purely on what they offer. Honestly, 32% more battery capacity on the vivo X300 Ultra does a lot of the persuading for me. There’s a bonus as well: the vivo X300 Ultra has a tougher IP68/IP69 rating. The Galaxy S26 Ultra’s strongest argument is an extra rear camera.
I’d steer camera fans toward the Galaxy S26 Ultra and battery & charging fans toward the vivo X300 Ultra.
My pick: I think most people will be happier with the vivo X300 Ultra, unless you’d trade the rest for an extra rear camera.
Personal opinion based on the data above. Your priorities may differ.