There is a difference in screen size (40 Inch (102 cm) vs 43 Inch (109.22 cm)), and a larger screen generally provides a more immersive viewing experience. 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 (24 W vs 2 Channel X 8 W), which can influence overall sound clarity and loudness. From a practical standpoint, both options provide a reliable viewing experience for most users. Mi TV5A40 and TCL 43S423 are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. Mi TV5A40 and TCL 43S423 differ in resolution (1920 x 1080 vs UHD), which can affect overall clarity and sharpness of the display. 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.