TCL 58S455-CA and Mi TV X55 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 with smart platforms that support popular streaming apps and voice control features. Audio output differs between the two (10 W + 10 W vs 30 W), which can influence overall sound clarity and loudness. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. There is a difference in screen size (58 Inch (147 cm) vs 55 Inch (139 cm)), and a larger screen generally provides a more immersive viewing experience. If you're comparing TCL 58S455-CA and Mi TV X55, both models come with modern features and are designed to deliver a solid viewing experience across different use cases. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content.

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