Xiaomi Mi 9 Pro vs. Asus ROG Phone II: A Deep Dive into Flagship Performance and Features
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🏆 Quick Verdict
For the average user prioritizing all-around functionality and cutting-edge charging tech, the Xiaomi Mi 9 Pro emerges as the winner. Its 40W wired and 30W wireless charging significantly outperform the ROG Phone II’s 30W wired charging, offering greater convenience. However, gamers will find the ROG Phone II’s optimized thermal design and gaming-centric features more compelling.
| PHONES | ||
|---|---|---|
| Phone Names | Xiaomi Mi 9 Pro | Asus ROG Phone II ZS660KL |
| Network | ||
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 |
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G bands | 1, 2, 3, 4, 5, 7, 8, 12, 17, 41 - China | 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 28, 29, 32, 34, 38, 39, 40, 41, 46 |
| Speed | HSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/150 Mbps | HSPA 42.2/5.76 Mbps, LTE (5CA) Cat18 (Cat20 Ultimate edition) 1200/150 Mbps |
| Technology | GSM / CDMA / HSPA / LTE | GSM / HSPA / LTE |
| CDMA 800 & TD-SCDMA | - | |
| Launch | ||
|---|---|---|
| Announced | 2019, September. Released 2019, September | 2019, July 22. Released 2019, September |
| Status | Discontinued | Discontinued |
| Body | ||
|---|---|---|
| Build | Glass front (Gorilla Glass 6), glass back (Gorilla Glass 5), aluminum frame (7000 series) | Glass front (Gorilla Glass 6), glass back (Gorilla Glass 3), aluminum frame |
| Dimensions | 157.2 x 74.6 x 8.5 mm (6.19 x 2.94 x 0.33 in) | 171 x 77.6 x 9.5 mm (6.73 x 3.06 x 0.37 in) |
| SIM | Nano-SIM + Nano-SIM | Nano-SIM + Nano-SIM |
| Weight | 196 g (6.91 oz) | 240 g (8.47 oz) |
| - | RGB light panel (on the back) | |
| Display | ||
|---|---|---|
| Protection | Corning Gorilla Glass 6 | Corning Gorilla Glass 6 |
| Resolution | 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density) | 1080 x 2340 pixels, 19.5:9 ratio (~391 ppi density) |
| Size | 6.39 inches, 100.2 cm2 (~85.5% screen-to-body ratio) | 6.59 inches, 106.6 cm2 (~80.3% screen-to-body ratio) |
| Type | Super AMOLED, HDR10 | AMOLED, 1B colors, 120Hz, HDR10 |
| Platform | ||
|---|---|---|
| CPU | Octa-core (1x2.96 GHz Kryo 485 & 3x2.42 GHz Kryo 485 & 4x1.8 GHz Kryo 485) | Octa-core (1x2.96 GHz Kryo 485 & 3x2.42 GHz Kryo 485 & 4x1.78 GHz Kryo 485) |
| Chipset | Qualcomm SM8150 Snapdragon 855+ (7 nm) | Qualcomm SM8150 Snapdragon 855+ (7 nm) |
| GPU | Adreno 640 (700 MHz) | Adreno 640 (700 MHz) |
| OS | Android 10, MIUI 11 | Android 9.0 (Pie), ROG UI |
| Memory | ||
|---|---|---|
| Card slot | No | No |
| Internal | 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM, 512GB 12GB RAM | 128GB 8GB RAM, 256GB 12GB RAM, 512GB 12GB RAM, 1TB 12GB RAM |
| UFS 2.1 | UFS 3.0 | |
| Main Camera | ||
|---|---|---|
| Dual | - | 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF 13 MP, f/2.4, 11mm (ultrawide) |
| Features | Laser AF, Dual-LED flash, HDR, panorama | Laser AF, LED flash, HDR, panorama |
| Single | - | 5 MP |
| Triple | 48 MP, f/1.8, 27mm (wide), 1/2.0", 0.8µm, PDAF 12 MP, f/2.2, 54mm (telephoto), 1/3.6", 1.0µm, PDAF, 2x optical zoom 16 MP, f/2.2, 13mm (ultrawide), 1/3.0", 1.0µm, PDAF | - |
| Video | 4K@30/60fps, 1080p@30/120/240fps, 1080p@960fps | 4K@30/60fps, 1080p@30/60/240fps, 720p@480fps; gyro-EIS (except @240/480fps) |
| Selfie camera | ||
|---|---|---|
| Features | HDR | Panorama, HDR |
| Single | 20 MP, f/2.0, (wide), 1/3", 0.9µm | 24MP, f/2.2, 0.9µm |
| Video | 1080p@30fps | 1080p@30fps |
| Sound | ||
|---|---|---|
| 3.5mm jack | No | Yes |
| 35mm jack | No | Yes |
| Loudspeaker | Yes | Yes, with DTS:X stereo speakers (2 dedicated amplifiers) |
| - | 24-bit/192kHz audio | |
| Comms | ||
|---|---|---|
| Bluetooth | 5.0, A2DP, LE, aptX HD | 5.0, A2DP, LE, aptX HD |
| Infrared port | Yes | - |
| NFC | Yes | Yes |
| Positioning | GPS (L1+L5), GLONASS (L1), BDS (B1), GALILEO (E1+E5a) | GPS (L1+L5), GLONASS, BDS, GALILEO, QZSS |
| Radio | No | FM radio |
| USB | USB Type-C 2.0, OTG | USB Type-C 3.1, accessory connector, OTG |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA | Wi-Fi 802.11 a/b/g/n/ac/ad, dual-band, Wi-Fi Direct |
| Features | ||
|---|---|---|
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass |
| Battery | ||
|---|---|---|
| Charging | 40W wired, QC4 30W wireless 10W reverse wireless | 30W wired 10W reverse wired, QC4 |
| Stand-by | - | Up to 150 h (3G) |
| Talk time | - | Up to 5 h (3G) |
| Type | Li-Po 4000 mAh, non-removable | Li-Po 6000 mAh, non-removable |
| Misc | ||
|---|---|---|
| Colors | Dream White, Titanium Black | Matte Black, Glossy Black |
| Models | - | ASUS_I001D, I001DA, I001DE, I001DC, I001DB, I001D, I001DD |
| Price | About 500 EUR | About 1070 EUR |
| Tests | ||
|---|---|---|
| Battery life | - | Endurance rating 114h |
| Camera | - | Photo / Video |
| Display | - | Contrast ratio: Infinite (nominal) |
| Loudspeaker | - | -19.5 LUFS (Excellent) |
| Performance | - | AnTuTu: 398935 (v7), 483239 (v8) GeekBench: 10923 (v4.4) GFXBench: 40fps (ES 3.1 onscreen) |
Xiaomi Mi 9 Pro
- Significantly faster wired and wireless charging (40W/30W)
- Reverse wireless charging capability
- Likely superior camera system (based on brand reputation)
- Potentially less optimized thermal management for sustained gaming
- Battery life likely lower than ROG Phone II
Asus ROG Phone II ZS660KL
- Exceptional battery life (114h endurance rating)
- Optimized thermal design for sustained gaming performance
- High display brightness (626 nits)
- Slower charging speeds (30W wired)
- No wireless charging
- Camera likely less advanced than Mi 9 Pro
Display Comparison
Both devices utilize the Snapdragon 855+ chipset, but their display approaches differ. The Asus ROG Phone II boasts a measured peak brightness of 626 nits, providing excellent visibility in bright conditions. While the Mi 9 Pro’s display specs aren’t provided, Xiaomi typically employs high-quality AMOLED panels. The ROG Phone II’s ‘Infinite’ contrast ratio, typical of OLED technology, delivers deep blacks and vibrant colors. The lack of detailed display specs for the Mi 9 Pro makes a direct comparison difficult, but the ROG Phone II’s brightness is a clear advantage for outdoor use.
Camera Comparison
Both phones feature 'Photo / Video' capabilities, but detailed camera specifications are absent. Given the ROG Phone II’s gaming focus, its camera system is likely optimized for general use rather than photographic excellence. The Mi 9 Pro, positioned as a flagship, likely incorporates a more sophisticated camera system with features like OIS and larger sensors. Without specific sensor size or aperture data, it’s difficult to make a definitive judgment, but Xiaomi’s history suggests a stronger emphasis on camera quality in its flagship devices.
Performance
Both the Xiaomi Mi 9 Pro and Asus ROG Phone II are powered by the Qualcomm Snapdragon 855+ (7nm). The CPUs are nearly identical, featuring an octa-core configuration with a 2.96 GHz Kryo 485 prime core, three 2.42 GHz Kryo 485 cores, and four 1.8 GHz (Mi 9 Pro) / 1.78 GHz (ROG Phone II) Kryo 485 cores. The slight difference in the lower core clock speeds is unlikely to be noticeable in real-world usage. However, the ROG Phone II’s design prioritizes thermal management, crucial for maintaining peak performance during extended gaming sessions. While the Mi 9 Pro offers strong performance, the ROG Phone II’s active cooling solutions (not detailed in the provided data, but a key feature) likely provide superior sustained performance under heavy load.
Battery Life
The Asus ROG Phone II boasts an impressive endurance rating of 114 hours, indicating exceptional battery life. The Mi 9 Pro’s battery capacity isn’t specified, but its 40W wired charging and 30W wireless charging capabilities are a significant advantage. The ROG Phone II offers 30W wired charging and 10W reverse wired charging. While the ROG Phone II excels in longevity, the Mi 9 Pro’s faster charging speeds allow for quicker top-ups, making it more convenient for users who frequently need to recharge. The Mi 9 Pro also adds 10W reverse wireless charging, a feature absent on the ROG Phone II.
Buying Guide
Buy the Xiaomi Mi 9 Pro if you need a versatile flagship with incredibly fast charging, both wired and wireless, and appreciate a more refined, everyday smartphone experience. Buy the Asus ROG Phone II ZS660KL if you prioritize sustained gaming performance, long battery life during intense sessions, and are willing to trade some charging convenience for a dedicated gaming experience.