Based on our overall comparison score, Vivo X300 Ultra rates higher at 84/100 versus 81/100 for Xiaomi 15 — a 3-point lead. Vivo X300 Ultra is the stronger overall pick, though the right choice still depends on which specs matter most to you; the full spec table above breaks down every difference.
Vivo X300 Ultra vs Xiaomi 15
Updated Nov 2026 · Scored by the Let’s Compare Data Engine · How we score
The Vivo X300 Ultra and Xiaomi 15 are closely matched at 75 and 73/100. The Vivo X300 Ultra edges ahead on Display and Rear Camera, while the Xiaomi 15 leads on Front Camera and Design & Weight — pick the one whose strengths match what you'll actually use.
Verdict
Our overall take, at a glance
Key takeaways
- Vivo X300 Ultra and Xiaomi 15 are closely matched overall (within 2 points).
- Vivo X300 Ultra stands out on Rear camera (megapixels): 200 MP (300% more), Rear Camera Optical zoom: 4.7 (81% more), Front camera (megapixels): 50 MP (56% more).
- Xiaomi 15 counters with Design & Weight Dimensions: 15.23 × 7.12 × 0.808 cm, Front camera aperture: 2 (20% less), Weight: 192 g (17% less).
Vivo X300 Ultra and Xiaomi 15 are closely matched
Vivo X300 Ultra
75
Xiaomi 15
73
Where Vivo X300 Ultra stands out
- Rear camera (megapixels): 200 MP (300% more)
- Rear Camera Optical zoom: 4.7 (81% more)
- Front camera (megapixels): 50 MP (56% more)
Where Xiaomi 15 stands out
- Design & Weight Dimensions: 15.23 × 7.12 × 0.808 cm
- Front camera aperture: 2 (20% less)
- Weight: 192 g (17% less)
In-depth analysisAI
AI-generated from the cited sources — may be incomplete or inaccurate; verify important details before deciding · generated Nov 2026.
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
Xiaomi 15
The Xiaomi 15 is a compact, high-performance Android smartphone built for users seeking top-tier capabilities in a pocket-friendly form factor. It features the powerful Qualcomm Snapdragon 8 Elite processor, a 6.36-inch LTPO AMOLED display with a 120 Hz refresh rate, and a versatile triple 50 MP Leica rear camera system. The device packs robust hardware, including rapid charging capabilities, into an easy-to-handle 181-gram body.
Best for One-handed smartphone operation and effortless pocket storageBest for Mobile gaming and heavy multitasking on a smaller, high-refresh-rate screenBest for Enthusiasts who want rapid wired and wireless battery top-ups
Pros
- Compact and lightweight 181g body that is highly pocketable
- Bright 1.5K LTPO AMOLED screen reaching a peak brightness of 3200 nits
- Fast charging speeds with 90W wired and 50W wireless capability
- High-resolution triple 50 MP rear camera array with optical image stabilization on the primary lens
Cons
- Lacks support for expandable storage via a memory card slot
- Smaller screen size compared to the 15 Pro and Ultra variants might limit immersion for media consumption
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.
Vivo X300 Ultra
Xiaomi 15
Performance
Higher benchmark score = faster
Vivo X300 Ultra2,723,497
Xiaomi 152,534,638
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
Vivo X300 Ultra6,600 mAh
Xiaomi 155,240 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
Vivo X300 UltraXiaomi 15
Vivo X300 Ultra is 40 g (21%) heavier than Xiaomi 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 Vivo X300 Ultra vs Xiaomi 15 comparison
Vivo X300 Ultra and Xiaomi 15 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 84/100 for Vivo X300 Ultra and 81/100 for Xiaomi 15.
If you want the higher-rated smartphones option overall, Vivo X300 Ultra (84/100) edges out Xiaomi 15 (81/100). But if Xiaomi 15 is cheaper or stronger on the specific specs you care about, it can still be the better buy — use the spec table and strengths profile above to decide.
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