Both models support 4K 3840 x 2160 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. TCL 50S446 and Mi TVX50 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. Both TVs come with smart platforms that support popular streaming apps and voice control features. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Both TVs come in similar screen sizes, making them suitable for comparable viewing setups and room environments. Audio output differs between the two (8 W + 8 W vs 30 W), which can influence overall sound clarity and loudness. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content.

Verdict: Both TVs are strong contenders, and your final choice should depend on your preference for screen size, motion performance, and smart features.