Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Audio output differs between the two (10 W + 10 W vs 20 W), which can influence overall sound clarity and loudness. Both TVs come with smart platforms that support popular streaming apps and voice control features. 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. 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. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. 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. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability.

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