From a practical standpoint, both options provide a reliable viewing experience for most users. TCL 43S455-CA features a 43 Inch (109.22 cm) screen while OnePlus 40 Y1 comes with 40 Inch (102 cm), which can make a noticeable difference depending on your room size and viewing distance. 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 20 W), which can influence overall sound clarity and loudness. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. TCL 43S455-CA and OnePlus 40 Y1 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. TCL 43S455-CA and OnePlus 40 Y1 differ in resolution (UHD vs 1920 x 1080), which can affect overall clarity and sharpness of the display.

Verdict: Both TVs are strong contenders, and your final choice should depend on your preference for screen size, motion performance, and smart features.