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. Panasonic TH-49GX655DX and Samsung HG50AT670UJ are well-equipped smart TVs that aim to provide a balance of picture quality, performance, and smart capabilities. Both models support 4K 3840 x 2160 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Both TVs come with smart platforms that support popular streaming apps and voice control features. Panasonic TH-49GX655DX features a 49 Inch (124.46 cm) screen while Samsung HG50AT670UJ comes with 50 Inch (126 cm), which can make a noticeable difference depending on your room size and viewing distance. Panasonic TH-49GX655DX and Samsung HG50AT670UJ offer different motion rates (60 Hz vs 100 Hz), which can impact smoothness during fast-moving scenes like sports and gaming.

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