Skyworth 75S1 and Haier H77C90EUX are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. There is a difference in screen size (75 Inch (191 cm) vs 77 Inch (195.58 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. From a practical standpoint, both options provide a reliable viewing experience for most users. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Skyworth 75S1 and Haier H77C90EUX offer different motion rates (60 Hz vs 120 Hz), which can impact smoothness during fast-moving scenes like sports and gaming. Both models support 4K 3840 x 2160 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions.

Verdict: Both models offer good value, and the better option depends on your specific requirements and viewing preferences.