Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. If you're comparing TCL 55S451-CA and Mi TV 4 PRO 55, both models come with modern features and are designed to deliver a solid viewing experience across different use cases. 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. Audio output differs between the two (10 W + 10 W vs 2 X 8 W), which can influence overall sound clarity and loudness. TCL 55S451-CA and Mi TV 4 PRO 55 differ in resolution (UHD vs 4K 3840 x 2160), which can affect overall clarity and sharpness of the display. Both TVs come in similar screen sizes, making them suitable for comparable viewing setups and room environments.

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