When should I choose Xiaomi 17 Ultra?

Users who prefer a larger 6.9-inch flat HyperRGB OLED display for photo editing and viewing. Photographers wanting a 50MP 1-inch Light Fusion main sensor with Leica optics. Users prioritizing faster 50W wireless charging speeds. Those looking for a slimmer 8.29 mm smartphone chassis profile. Fans of HyperOS 3 with Super Island multitasking integration.

When should I choose vivo X300 Ultra?

Mobile photographers requiring dual 200MP sensors and support for a 400mm telephoto extender. Users wanting a brighter 3,300-nit display with a faster 144Hz refresh rate. Those needing heavy-duty durability with complete IP68 and high-pressure IP69 water/dust resistance. Buyers wanting longer software longevity with 7 years of security patches alongside 5 major OS upgrades. Users prioritizing faster 100W wired FlashCharge and a 6,600mAh silicon-carbon battery.

What are the advantages of Xiaomi 17 Ultra over vivo X300 Ultra?

Equipped with a Leica-engineered camera system featuring a large 50MP 1-inch Light Fusion primary sensor paired with a 200MP mechanical zoom telephoto module.. Features a slightly larger 6.9-inch flat HyperRGB OLED display with an adaptive 1-120Hz LTPO refresh rate.. Provides faster 50W wireless charging alongside a 6000mAh to 6800mAh battery configuration with 90W wired fast charging.. Sports a slim chassis profile measuring just 8.29 mm in thickness for comfortable handling..

What are the advantages of vivo X300 Ultra over Xiaomi 17 Ultra?

Features a ZEISS Master Lenses collection with dual 200MP camera sensors and support for a 400mm telephoto extender accessory.. Boasts a 6.82-inch LTPO AMOLED display with a high 144Hz refresh rate and up to 3,300 nits peak brightness.. Packed with a high-density 6,600mAh silicon-carbon battery supporting fast 100W wired FlashCharge.. Delivers superior environmental resilience with dual IP68 and high-pressure IP69 water and dust ingress protection ratings.. Guarantees long-term software support with 5 major OS upgrades and 7 years of security patches running OriginOS 6..

AI comparison report

Xiaomi 17 Ultra vs vivo X300 Ultra

By CompareAI Editorial Team · Published 2026-09-26 · How we compare

The vivo X300 Ultra outperforms the Xiaomi 17 Ultra in display brightness, wired charging speed, durability, and camera hardware versatility, while the Xiaomi…

Who wins: Xiaomi 17 Ultra or vivo X300 Ultra?

Choose the vivo X300 Ultra first if maximum zoom reach, screen brightness, wired charging speed, and rugged IP68/IP69 environmental durability are top priorities; choose the Xiaomi 17 Ultra if a slim 8.29 mm chassis, 1-inch primary sensor, larger 6.9-inch flat display, and 50W wireless charging better suit daily habits.

Based on our analysis across 5 dimensions with 20 sources, Xiaomi 17 Ultra scores 8.3/10 overall while vivo X300 Ultra scores 9.2/10 overall.

Dimension	Xiaomi 17 Ultra	vivo X300 Ultra
Camera System & Optics	9.1/10	9.5/10
Display & Visual Experience	8.8/10	9.4/10
Battery Life & Charging Speeds	8.5/10	9/10
Build, Ergonomics & Durability	6.2/10	9.1/10
Software & Operating System	8.7/10	9.1/10
Overall	8.3/10	9.2/10

Should I choose Xiaomi 17 Ultra or vivo X300 Ultra?

Verdict: Choose the vivo X300 Ultra first if maximum zoom reach, screen brightness, wired charging speed, and rugged IP68/IP69 environmental durability are top priorities; choose the Xiaomi 17 Ultra if a slim 8.29 mm chassis, 1-inch primary sensor, larger 6.9-inch flat display, and 50W wireless charging better suit daily habits.

The vivo X300 Ultra outperforms the Xiaomi 17 Ultra in display brightness, wired charging speed, durability, and camera hardware versatility, while the Xiaomi 17 Ultra offers a slimmer design and faster wireless charging.

The vivo X300 Ultra is the stronger overall flagship, leading with dual 200MP sensors, an available 400mm telephoto extender, a 6.82-inch display reaching 3,300 nits at 144Hz, a 6,600mAh silicon-carbon battery with 100W wired charging, full IP68/IP69 ingress protection, and 7 years of security patches. In comparison, the Xiaomi 17 Ultra remains appealing for users seeking an 8.29 mm slim profile, a larger 6.9-inch 120Hz flat display, a 50MP 1-inch Light Fusion Leica main sensor, 50W wireless charging over vivo's 40W, and 6 years of security patches.

Best for Xiaomi 17 Ultra

Users who prefer a larger 6.9-inch flat HyperRGB OLED display for photo editing and viewing
Photographers wanting a 50MP 1-inch Light Fusion main sensor with Leica optics
Users prioritizing faster 50W wireless charging speeds
Those looking for a slimmer 8.29 mm smartphone chassis profile
Fans of HyperOS 3 with Super Island multitasking integration

Best for vivo X300 Ultra

Mobile photographers requiring dual 200MP sensors and support for a 400mm telephoto extender
Users wanting a brighter 3,300-nit display with a faster 144Hz refresh rate
Those needing heavy-duty durability with complete IP68 and high-pressure IP69 water/dust resistance
Buyers wanting longer software longevity with 7 years of security patches alongside 5 major OS upgrades
Users prioritizing faster 100W wired FlashCharge and a 6,600mAh silicon-carbon battery

When not to compare directly

Do not compare the Xiaomi 17 Ultra and vivo X300 Ultra directly if extreme environmental water immersion or high-pressure water jet resistance is a mandatory requirement, as the Xiaomi 17 Ultra offers basic IP54 protection compared to the vivo X300 Ultra's IP68/IP69 ratings.

What are the key differences between Xiaomi 17 Ultra and vivo X300 Ultra?

Camera System & Optics

While the Xiaomi 17 Ultra relies on a 50MP 1-inch primary sensor with a 200MP telephoto lens, the vivo X300 Ultra delivers dual 200MP sensors with support for a 400mm telephoto extender.
Xiaomi 17 Ultra: The Xiaomi 17 Ultra features a Leica-engineered camera system equipped with a 50MP 1-inch Light Fusion primary sensor paired with a 200MP mechanical zoom telephoto module.
vivo X300 Ultra: The vivo X300 Ultra incorporates a ZEISS Master Lenses collection featuring dual 200MP camera sensors and support for a 400mm telephoto extender accessory.
Scores — Xiaomi 17 Ultra: 9.1/10, vivo X300 Ultra: 9.5/10
Imaging performance is the defining selling point of ultra-flagships, influencing photo clarity, zoom range, low-light capture, and color science.
Sources: Vivo Confirms X300 Ultra Global Launch While Unveiling ..., Xiaomi 17 Ultra Review: Leica Imaging, 1-Inch Sensor, 200MP ...
Display & Visual Experience

While the Xiaomi 17 Ultra features a slightly larger 6.9-inch 120Hz panel, the vivo X300 Ultra offers a faster 144Hz refresh rate and reaches up to 3,300 nits peak brightness on its 6.82-inch display.
Xiaomi 17 Ultra: Xiaomi 17 Ultra features a 6.9-inch flat HyperRGB OLED display with an adaptive 1-120Hz LTPO refresh rate designed for visual comfort and color fidelity.
vivo X300 Ultra: vivo X300 Ultra delivers a 6.82-inch LTPO AMOLED display capable of a faster 144Hz refresh rate and up to 3,300 nits of peak brightness for demanding multimedia use.
Scores — Xiaomi 17 Ultra: 8.8/10, vivo X300 Ultra: 9.4/10
The screen quality determines daily visual comfort, color fidelity for photo editing, and responsiveness during multimedia and gaming.
Sources: vivo X300 Ultra - Full phone specifications, All Specs, Features of Xiaomi 17 Ultra
Battery Life & Charging Speeds

While the vivo X300 Ultra offers a 6,600mAh silicon-carbon battery with faster 100W wired charging, the Xiaomi 17 Ultra provides faster 50W wireless charging alongside its 6000mAh/6800mAh battery options.
Xiaomi 17 Ultra: The Xiaomi 17 Ultra features a 6000mAh to 6800mAh battery configuration paired with 90W wired fast charging and 50W wireless charging speeds.
vivo X300 Ultra: The vivo X300 Ultra features a high-density 6,600mAh silicon-carbon battery supported by 100W wired FlashCharge and 40W wireless charging capabilities.
Scores — Xiaomi 17 Ultra: 8.5/10, vivo X300 Ultra: 9/10
Flagship camera hardware and high-brightness displays require substantial power reserves and fast recharge turnaround.
Sources: vivo X300 Ultra - Full phone specifications, All Specs, Features of Xiaomi 17 Ultra
Build, Ergonomics & Durability

While the Xiaomi 17 Ultra offers a slim 8.29 mm chassis with basic IP54 protection, the vivo X300 Ultra delivers far superior durability with complete IP68 and IP69 submersible water and dust ingress ratings.
Xiaomi 17 Ultra: The Xiaomi 17 Ultra prioritizes a slim hand feel with an 8.29 mm chassis profile, but offers basic environmental protection limited to an IP54 splash- and dust-resistance rating [9].
vivo X300 Ultra: The vivo X300 Ultra emphasizes maximum environmental resilience by incorporating dual IP68 and high-pressure IP69 water and dust ingress protection ratings [8].
Scores — Xiaomi 17 Ultra: 6.2/10, vivo X300 Ultra: 9.1/10
Chassis thickness, weight distribution, and ingress protection dictate real-world handling comfort and environmental resilience.
Sources: vivo X300 Ultra - Full phone specifications, All Specs, Features of Xiaomi 17 Ultra
Software & Operating System

While both flagships commit to 5 major Android OS upgrades, the vivo X300 Ultra edges ahead by guaranteeing 7 years of security patches compared to 6 years for the Xiaomi 17 Ultra.
Xiaomi 17 Ultra: The Xiaomi 17 Ultra runs HyperOS 3 built on Android 16, offering refined animations, Super Island multitasking widgets, deep Leica photo-processing integration, and a support commitment of 5 major OS upgrades with 6 years of security patches [11].
vivo X300 Ultra: The vivo X300 Ultra runs OriginOS 6 on Android 16 across both Chinese and international units, delivering over 2,800 redesigned icons, ZEISS image workflow controls, and an extended commitment of 5 major OS upgrades alongside 7 years of security patches [8, 10].
Scores — Xiaomi 17 Ultra: 8.7/10, vivo X300 Ultra: 9.1/10
The operating system impacts daily fluidity, ecosystem integration, photo-processing workflows, and long-term software support.
Sources: vivo X300 Ultra - Full phone specifications, Xiaomi 17 Ultra (Global) review: Camera

What are the pros and cons of Xiaomi 17 Ultra vs vivo X300 Ultra?

Xiaomi 17 Ultra

Strengths

Equipped with a Leica-engineered camera system featuring a large 50MP 1-inch Light Fusion primary sensor paired with a 200MP mechanical zoom telephoto module.
Features a slightly larger 6.9-inch flat HyperRGB OLED display with an adaptive 1-120Hz LTPO refresh rate.
Provides faster 50W wireless charging alongside a 6000mAh to 6800mAh battery configuration with 90W wired fast charging.
Sports a slim chassis profile measuring just 8.29 mm in thickness for comfortable handling.

Weaknesses

Offers only basic IP54 splash- and dust-resistance protection instead of full submersible waterproofing.
Display refresh rate maxes out at 120Hz, falling short of faster 144Hz panels.
Security support commitment is limited to 6 years of patches, which is shorter than the 7 years offered by the vivo X300 Ultra.

vivo X300 Ultra

Strengths

Features a ZEISS Master Lenses collection with dual 200MP camera sensors and support for a 400mm telephoto extender accessory.
Boasts a 6.82-inch LTPO AMOLED display with a high 144Hz refresh rate and up to 3,300 nits peak brightness.
Packed with a high-density 6,600mAh silicon-carbon battery supporting fast 100W wired FlashCharge.
Delivers superior environmental resilience with dual IP68 and high-pressure IP69 water and dust ingress protection ratings.
Guarantees long-term software support with 5 major OS upgrades and 7 years of security patches running OriginOS 6.

Weaknesses

Wireless charging speed is capped at 40W, which is slower than the Xiaomi 17 Ultra's 50W wireless charging.

Where does this data come from?

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Xiaomi 17 Ultra vs vivo X300 Ultra

Who wins: Xiaomi 17 Ultra or vivo X300 Ultra?

Should I choose Xiaomi 17 Ultra or vivo X300 Ultra?

Best for Xiaomi 17 Ultra

Best for vivo X300 Ultra

When not to compare directly

What are the key differences between Xiaomi 17 Ultra and vivo X300 Ultra?

Camera System & Optics

Display & Visual Experience

Battery Life & Charging Speeds

Build, Ergonomics & Durability

Software & Operating System

What are the pros and cons of Xiaomi 17 Ultra vs vivo X300 Ultra?

Xiaomi 17 Ultra

Strengths

Weaknesses

vivo X300 Ultra

Strengths

Weaknesses

Where does this data come from?

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