Which flagship smartphone is the better deal: Oppo Find X9 Ultra vs. Vivo X300 Ultra review results

The difference between the Oppo Find X9 Ultra and Vivo X300 Ultra is clear when it comes to audio quality. The Oppo phone delivers more powerful and balanced speakers and the drivers offer more depth, more stable highs as well as a significantly more linear frequency response in our measurements. The SPL value is also around 4.5 dBA higher than that of the Vivo phone, which sounds flatter in direct comparison and drops more sharply at high frequencies.

Another advantage of the Find X9 Ultra is its battery life. The 7,050 mAh silicon-carbon battery lasts over five hours longer in the Wi-Fi battery test than the 6,600 mAh battery of the Vivo X300 Ultra. This is a difference that is definitely noticeable in everyday use. The slightly lower temperature development also speaks in favor of the Oppo flagship. Both top phones struggle with the high heat output of the Snapdragon 8 Elite Gen 5 under continuous load, but the Vivo phone reaches almost 55 °C in our measurements, while the Find X9 Ultra's case remains slightly cooler at around 50 °C.

The Find X9 Ultra is also ahead in terms of connectivity and storage performance. It even sets new records in our Wi-Fi measurements, while the Vivo flagship only achieves around half the speed. However, the approximately 2,000 Mbit/s of the Vivo phone is more than sufficient in everyday use, so the Find X9 Ultra's advantage is more theoretical. The situation is similar with UFS storage. Here, the Oppo flagship is almost twice as fast in our reviewbut the practical added value is likely to be rather small.

On the other hand, the Vivo X300 Ultra has noticeable advantages when it comes to the display and cameras. The 6.82-inch OLED panel is significantly brighter in everyday use than the Oppo phone's 144 Hz screen. While the Find X9 Ultra only achieves around half of the advertised maximum brightness and cannot maintain it for long, the Vivo phone remains stable in our measurements and impresses with better automatic brightness control. Oppo's automatic brightness control often sets it too low in everyday use. The vibration motor also seems more powerful on the Vivo phone, a point that is often underestimated in everyday use.

The Vivo X300 Ultra is also ahead in terms of camera quality. The ultra-wide-angle camera delivers visibly better results thanks to its larger sensor, and the main camera also benefits from Vivo's truly excellent, probably industry-leading software. The Oppo Find X9 Ultra can keep up here, but in our opinion, it does not quite reach the level of the Vivo flagship. On the other hand, the Oppo flagship offers practical special buttons, including for camera functions, which the Vivo model completely lacks.