They are closely matched: OnePlus 15 scores 81/100 and Vivo X300 Ultra scores 80/100 in our overall comparison — within 1 point. Neither is a clear winner overall, so the decision comes down to the specific features and price that matter most to you.
OnePlus 15 vs Vivo X300 Ultra
Updated Nov 2026 · Scored by the Let’s Compare Data Engine · How we score
For most buyers the OnePlus 15 is the better pick — it scores 77/100 to the Vivo X300 Ultra's 74, leading on Memory and Storage. Choose the Vivo X300 Ultra instead if display and rear camera matter most to you, where it comes out ahead.
Verdict
Our overall take, at a glance
Key takeaways
- OnePlus 15 and Vivo X300 Ultra are closely matched overall (within 3 points).
- OnePlus 15 stands out on Storage capacity: 1,024 GB (300% more), Memory RAM capacity: 16 GB (33% more), Display Refresh rate: 165 Hz (15% more).
- Vivo X300 Ultra counters with Rear camera (megapixels): 200 MP (300% more), Front camera (megapixels): 50 MP (56% more), Display Resolution: 1440 × 3168 px.
OnePlus 15 and Vivo X300 Ultra are closely matched
OnePlus 15
77
Vivo X300 Ultra
74
Where OnePlus 15 stands out
- Storage capacity: 1,024 GB (300% more)
- Memory RAM capacity: 16 GB (33% more)
- Display Refresh rate: 165 Hz (15% more)
Where Vivo X300 Ultra stands out
- Rear camera (megapixels): 200 MP (300% more)
- Front camera (megapixels): 50 MP (56% more)
- Display Resolution: 1440 × 3168 px
In-depth analysisAI
AI-generated from the cited sources — may be incomplete or inaccurate; verify important details before deciding · generated Nov 2026.
OnePlus 15
The OnePlus 15 is a flagship smartphone that represents a highly unconventional generational update, described by reviewers as a significant departure from standard annual refreshes. Produced by Oppo-backed OnePlus, the device leverages the brand's legacy of focusing on a high price-to-performance ratio and custom software integration. Specific hardware specifications and processor details are not documented in the provided source materials.
Best for Buyers looking for a smartphone that delivers a major departure from standard…Best for Users interested in a device from a brand historically committed to strong…
Pros
- Characterized by reviewers as a highly unique and non-traditional product update rather than an incremental change
- Benefits from the manufacturer's established history of balancing high-end quality with competitive pricing
- Backed by shared supply chain and manufacturing resources with Oppo
Cons
- The brand has historically faced criticism regarding customer support and past issues with app performance throttling
Vivo X300 Ultra
The Vivo X300 Ultra is a high-end flagship smartphone designed for mobile photography enthusiasts and power users looking for professional-grade imaging capabilities. It is powered by the Snapdragon 8 Elite Gen 5 processor paired with LPDDR5X memory, featuring a large 6.82-inch 144Hz LTPO AMOLED display and an advanced multi-sensor camera array anchored by a 200MP main sensor and a 200MP periscope telephoto lens.
Best for long-range and telephoto mobile photographyBest for high-frame-rate 4K and 8K video captureBest for all-day heavy multimedia usage
Pros
- Extensive multi-focal length camera setup featuring high-resolution 200MP main and telephoto sensors with OIS
- High-capacity 6600mAh battery supporting 100W wired and 40W wireless charging
- Vibrant 6.82-inch LTPO AMOLED display with adaptive 1-144Hz refresh rate and Dolby Vision support
- Robust performance driven by the Snapdragon 8 Elite Gen 5 chip and UFS 4.1 storage
Cons
- Bulky physical footprint with a weight of 232g or more depending on the finish
- Lacks expandable storage via a microSD card slot
- Absence of a traditional 3.5mm headphone jack
Value for Money
Which is the better deal for the price
Pre-filled with launch prices where known — enter today's price for an up-to-date check. Use the same currency for both.
OnePlus 15
Vivo X300 Ultra
Performance
Higher benchmark score = faster
OnePlus 152,790,237
Vivo X300 Ultra2,723,497
Benchmark score — a measured indicator of raw performance, not a guarantee of real-world speed.
Battery capacity
Larger cell — a hardware spec, not battery life
OnePlus 157,300 mAh
Vivo X300 Ultra6,600 mAh
Capacity is the raw battery size. Real-world battery life depends just as much on the processor, software and display.
Physical Comparison
Weigh them up, then compare real dimensions in 3D
OnePlus 15Vivo X300 Ultra
Vivo X300 Ultra is 21 g (10%) heavier than OnePlus 15.
Review Videos
Hand-picked expert reviews for each product
Detailed Specifications
The full spec sheet, side by side
Frequently Asked Questions
Common questions about OnePlus 15 vs Vivo X300 Ultra comparison
OnePlus 15 and Vivo X300 Ultra are compared side by side above across every spec in the smartphones category — including performance, features and design — each scored 0–100 so you can see exactly where one leads the other. Our overall scores are 81/100 for OnePlus 15 and 80/100 for Vivo X300 Ultra.
It's close — OnePlus 15 (81/100) and Vivo X300 Ultra (80/100) score almost the same. Pick based on price and the individual specs that matter most to you; the comparison above shows where each one pulls ahead.
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