Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. There is a difference in screen size (50 Inch (126 cm) vs 49 Inch (124.46 cm)), and a larger screen generally provides a more immersive viewing experience. Sansui SMC50FH18X and Panasonic TH-49GX655DX differ in resolution (1920 x 1080 vs 4K 3840 x 2160), which can affect overall clarity and sharpness of the display. Sansui SMC50FH18X and Panasonic TH-49GX655DX offer different motion rates (NA vs 60 Hz), which can impact smoothness during fast-moving scenes like sports and gaming. Sansui SMC50FH18X and Panasonic TH-49GX655DX are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. In general, both TVs cater to modern entertainment needs, including streaming, gaming, and everyday viewing. Both TVs come with smart platforms that support popular streaming apps and voice control features. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience.

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