Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Haier 55S9QT and TCL 55C61B offer different motion rates (120 Hz vs 60 Hz), which can impact smoothness during fast-moving scenes like sports and gaming. Both TVs come with smart platforms that support popular streaming apps and voice control features. Haier 55S9QT and TCL 55C61B are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Both TVs come in similar screen sizes, making them suitable for comparable viewing setups and room environments. Both models support 4K 3840 x 2160 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming. 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.