iQOO 15 Ultra vs X300 Pro
Winner
Vivo iQOO 15 Ultra
The iQOO 15 Ultra wins this one, taking performance and software longevity decisively. Against the X300 Pro it's also the sounder buy at $10.08 per month of safe use.
Value Score: iQOO 15 Ultra 79 · X300 Pro 70 — methodology
Who should pick which
Beyond the scores — our take on each phone and the buyer it actually suits.
iQOO's no-compromise gaming flagship pairs a Snapdragon 8 Elite Gen 5, a 7,400mAh battery and a 59-blade cooling fan with an unusually long 5-year OS / 7-year security promise that keeps it safe to use into 2033.
Pick it if
- ✓ Mobile gamers who keep phones for years
- ✓ Performance buyers who want the longest support window
Skip it if
- ✗ You need an official US warranty and full carrier bands
- ✗ You want a light, compact phone
The X300 Pro pairs a genuinely best-in-class 200MP periscope camera with a 7-year security-patch runway, so it ages well even without US carrier backing.
Pick it if
- ✓ mobile photographers wanting periscope zoom
- ✓ buyers who keep phones 5+ years
Skip it if
- ✗ you need official US support
- ✗ you want the lightest flagship possible
The lifespan decider
When specs are close, support length decides it — this is what each phone costs per month of safe use.
Category by category
Both displays are effectively the same class.
The iQOO 15 Ultra's Qualcomm Snapdragon 8 Elite Gen 5 is simply the faster chip.
The X300 Pro has the stronger camera system — same lens count, higher-grade sensors.
Battery capacities are close enough not to decide this.
The iQOO 15 Ultra is supported until Feb 2033 — 3 months longer than the X300 Pro.
Overall value goes to the iQOO 15 Ultra at $10.08 per month of safe use.
Frequently asked
When does the iQOO 15 Ultra stop getting updates?
iQOO backs the iQOO 15 series with 5 major Android OS upgrades and 7 years of security patches, so a unit bought at the February 2026 launch is covered until roughly February 2033. That carries it from Android 16 all the way to Android 21 and is one of the longest support windows on any performance-focused Android phone, comfortably beating dedicated gaming handsets that typically stop at two or three years.
Is the iQOO 15 Ultra worth buying in 2026?
Yes, if you want maximum performance and plan to keep the phone. Even midway through 2026 you still have around six and a half years of security coverage ahead, the Snapdragon 8 Elite Gen 5 will not feel slow for years, and the 7,400mAh battery ages gracefully. The main caveats are the 227g weight and the import-only availability outside China.
How long will the Vivo X300 Pro receive updates?
Vivo promises 5 major Android OS upgrades and 7 years of security patches for the X300 Pro from its October 2025 launch, putting its end-of-support date around October 2032 — nearly seven years of safe ownership if bought new.
Is the X300 Pro worth it if I'm outside China and India?
It launched officially across Europe and several Asian markets at EUR 1,399, so European and Southeast Asian buyers get manufacturer warranty support; US buyers are limited to importers with no official Vivo backing.
Full spec table
| Spec | iQOO 15 Ultra | X300 Pro |
|---|---|---|
| Price (street) | $790 | $980 |
| Display | 6.85-inch AMOLED, 1440x3168, 144Hz, up to 8000 nits peak, Dolby Vision | 6.78-inch LTPO AMOLED, 2800x1260, 120Hz, up to 4500 nits peak brightness |
| Chipset | Qualcomm Snapdragon 8 Elite Gen 5 | MediaTek Dimensity 9500 |
| RAM | 16GB/24GB | 12GB/16GB |
| Storage | 256GB/512GB/1TB | 256GB/512GB/1TB |
| Battery | 7,400 mAh | 6,510 mAh |
| Charging | 100W wired, 40W wireless | 90W wired, 40W wireless |
| Rear cameras | 50MP main, 50MP telephoto 3x, 50MP ultra-wide | 50MP main, 200MP periscope 3.7x, 50MP ultra-wide |
| Dimensions | 163.7 x 76.8 x 8.7 mm | 161.2 x 75.5 x 8.0 mm |
| Weight | 227 g | 226 g |
| Water resistance | IP68/IP69 | IP68/IP69 |
| Supported until | Feb 2033 | Oct 2032 |
More comparisons
Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.