The main selling points of the S24 Ultra are its flat screen, great software features, versatile camera array, brand recognition, strong resale value, and local support. Chinese phones, even with global rom, can sometimes be problematic for us, especially with app compatibility and delayed notifications.
In terms of video, I would say the S24 Ultra's cameras are more consistent in quality across all lenses. With most Chinese phones, there is often a huge difference in video quality between the main sensor and secondary ones.
Regarding the S24 Ultra's display, I believe it is currently the only one with a flat 2K resolution screen out of all the latest flagship phones. And the new Gorilla Amor glass helps with reducing reflection. However, its PWM dimming is only at 480Hz, while Chinese-made displays can reach over 4000Hz, which helps reduce eye strain.
There is no perfect phone - just choose the one that best fits your needs.