Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. There is a difference in screen size (43 Inch (109.22 cm) vs 40 Inch (102 cm)), and a larger screen generally provides a more immersive viewing experience. Westinghouse WD43UB4530 and TCL 40S355-CA differ in resolution (4K 3840 x 2160 vs 1920 x 1080), which can affect overall clarity and sharpness of the display. From a practical standpoint, both options provide a reliable viewing experience for most users. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Westinghouse WD43UB4530 and TCL 40S355-CA are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. Both TVs come with smart platforms that support popular streaming apps and voice control features.

Verdict: Choosing between Westinghouse WD43UB4530 and TCL 40S355-CA depends on your usage, whether you prioritize display quality, smoother motion, or smart features.