Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. TCL 55S423-CA and Mi Xiaomi TV Q2 55 differ in resolution (UHD vs 4K 3840 x 2160), which can affect overall clarity and sharpness of the display. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. Both TVs come in similar screen sizes, making them suitable for comparable viewing setups and room environments. TCL 55S423-CA and Mi Xiaomi TV Q2 55 offer different motion rates (120 Hz vs 60 Hz), which can impact smoothness during fast-moving scenes like sports and gaming. TCL 55S423-CA and Mi Xiaomi TV Q2 55 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. Audio output differs between the two (2 Channel X 8 W vs 15 W + 15 W), which can influence overall sound clarity and loudness. Both TVs come with smart platforms that support popular streaming apps and voice control features.

Verdict: Both models offer good value, and the better option depends on your specific requirements and viewing preferences.