OPPO A78 5G vs Xiaomi 15 Ultra
The Verdict
These phones serve entirely different market segments. The OPPO A78 5G targets budget-conscious buyers with a practical 6.56-inch IPS LCD display at 90Hz, 5000 mAh battery with 33W charging, and a basic 50 MP main camera producing 1080p video. The Snapdragon equivalent MediaTek Dimensity 700 handles everyday tasks competently, while 4 GB or 8 GB RAM manages basic multitasking. Its IPX4 rating offers splash protection, and the plastic build keeps costs down. The Xiaomi 15 Ultra sits in the flagship tier with a 6.73-inch LTPO AMOLED display delivering 3200 x 1440 resolution and extreme 3200-nit brightness, plus a 1-120 Hz adaptive refresh rate. Performance leaps forward with the Snapdragon 8 Elite processor and 16 GB RAM, while the camera system features a 1-inch 50 MP main sensor, 200 MP 5x telephoto, and 50 MP ultrawide for professional-grade photography and 8K video. Battery capacity reaches 5810 mAh with 90W wired and 50W wireless charging. Build quality jumps to titanium and Gorilla Glass Victus 2 with full IP68 rating. At a $750 price difference, the Xiaomi 15 Ultra delivers superior performance, imaging capability, display quality, and durability. Choose the OPPO A78 5G for basic smartphones needs on a tight budget, or invest in the Xiaomi 15 Ultra for flagship features and camera excellence.
Who Should Buy
Buy the OPPO A78 5G if…
- →5G connectivity at a budget-friendly price point
- →33W SUPERVOOC fast charging is quick for the price segment
- →5000 mAh battery provides solid two-day endurance
Buy the Xiaomi 15 Ultra if…
- →200MP periscope telephoto with 5x optical zoom rivals Galaxy S25 Ultra
- →1-inch main sensor with Leica optics produces stunning photos
- →Titanium frame gives a premium, durable build
Category Scores
Pros & Cons
OPPO A78 5G
Pros
- 5G connectivity at a budget-friendly price point
- 33W SUPERVOOC fast charging is quick for the price segment
- 5000 mAh battery provides solid two-day endurance
- 90Hz refresh rate for smoother scrolling than 60Hz
- IPX4 splash resistance adds basic water protection
Cons
- IPS LCD lacks AMOLED vibrancy and contrast
- Dimensity 700 is basic — struggles with demanding apps
- 2 MP depth sensor is essentially useless
- 8 MP front camera is low resolution for selfies
- ColorOS includes pre-installed bloatware
Xiaomi 15 Ultra
Pros
- 200MP periscope telephoto with 5x optical zoom rivals Galaxy S25 Ultra
- 1-inch main sensor with Leica optics produces stunning photos
- Titanium frame gives a premium, durable build
- 4K@120fps video recording is industry-leading
- 90W fast charging and 50W wireless on a huge 5810 mAh battery
Cons
- Heavy at 229 g and thick at 9.17 mm
- Very expensive at $999 with limited global availability
- HyperOS software experience lags behind iOS and One UI
- Camera bump is extremely large
Full Specifications
| Spec | OPPO A78 5G | Xiaomi 15 Ultra |
|---|---|---|
| Software | Android 13 (ColorOS 13) | Android 15 (HyperOS 2) |
| Body | ||
| Weight | 188 g | 229 g |
| Material | Plastic frame and back | Titanium frame, Gorilla Glass Victus 2 |
| IP rating | IPX4 | IP68 |
| Dimensions | 163.8 x 75.1 x 8.0 mm | 161.1 x 75.2 x 9.17 mm |
| Camera | ||
| Main camera | 50 MP, f/1.8, PDAF | 50 MP, f/1.63, OIS (1-inch sensor) |
| Depth | 2 MP, f/2.4 | — |
| Front camera | 8 MP, f/2.0 | 32 MP, f/2.0 |
| Video | 1080p@30fps | 8K@30fps, 4K@120fps |
| Telephoto | — | 200 MP, f/2.6, 5x periscope optical zoom, OIS |
| Ultrawide | — | 50 MP, f/2.0, 128-degree |
| Memory | ||
| RAM | 4 GB / 8 GB | 16 GB |
| Storage options | 128 GB | 256 GB, 512 GB, 1 TB |
| Battery | ||
| Capacity | 5000 mAh | 5810 mAh |
| Charging | 33W SUPERVOOC | 90W wired |
| Wireless charging | No | 50W wireless |
| Display | ||
| Size | 6.56 inches | 6.73 inches |
| Type | IPS LCD | LTPO AMOLED |
| Resolution | 2400 x 1080 | 3200 x 1440 |
| Refresh rate | 90Hz | 1-120Hz |
| Brightness (nits) | 680 | 3200 |
| Processor | ||
| CPU | Octa-core (2x2.2 GHz + 6x2.0 GHz) | Octa-core (2x4.32 GHz + 6x3.53 GHz) |
| GPU | Mali-G57 MC2 | Adreno 830 |
| Chipset | MediaTek Dimensity 700 | Qualcomm Snapdragon 8 Elite |
| Connectivity | ||
| 5G | ||
| NFC | ||
| USB | USB-C 2.0 | USB-C 3.2 |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 7 |
| Bluetooth | 5.3 | 5.4 |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
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