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. 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 provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Both models support 4K 3840 x 2160 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming. In general, both TVs cater to modern entertainment needs, including streaming, gaming, and everyday viewing. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Both TVs come with smart platforms that support popular streaming apps and voice control features. If you're comparing Skyworth 75S1 and Haier H77C90EUX, both models come with modern features and are designed to deliver a solid viewing experience across different use cases.

Verdict: Choosing between Skyworth 75S1 and Haier H77C90EUX depends on your usage, whether you prioritize display quality, smoother motion, or smart features.