Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. 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. Both TVs come with smart platforms that support popular streaming apps and voice control features. Audio output differs between the two (10 W + 10 W vs 2 X 8 W), which can influence overall sound clarity and loudness. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. From a practical standpoint, both options provide a reliable viewing experience for most users. TCL 55S451-CA and Mi TV 4 PRO 55 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users.

Verdict: Choosing between TCL 55S451-CA and Mi TV 4 PRO 55 depends on your usage, whether you prioritize display quality, smoother motion, or smart features.