Audio output differs between the two (12 W + 12 W vs 15 W + 15 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 75S434 and Toshiba 75U7950 offer different motion rates (120 Hz vs 60 Hz), which can impact smoothness during fast-moving scenes like sports and gaming. Both TVs come in similar screen sizes, making them suitable for comparable viewing setups and room environments. TCL 75S434 and Toshiba 75U7950 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 offer adequate brightness levels suitable for most indoor lighting conditions. TCL 75S434 and Toshiba 75U7950 are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities.

Verdict: Choosing between TCL 75S434 and Toshiba 75U7950 depends on your usage, whether you prioritize display quality, smoother motion, or smart features.