Both TVs come with smart platforms that support popular streaming apps and voice control features. Panasonic TH-58HX450 and Samsung HG55AT670UJ offer different motion rates (60 Hz vs 100 Hz), which can impact smoothness during fast-moving scenes like sports and gaming. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. Panasonic TH-58HX450 and Samsung HG55AT670UJ are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Panasonic TH-58HX450 features a 58 Inch (147 cm) screen while Samsung HG55AT670UJ comes with 55 Inch (139 cm), which can make a noticeable difference depending on your room size and viewing distance. Both models support 4K 3840 x 2160 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming.

Verdict: Both TVs are strong contenders, and your final choice should depend on your preference for screen size, motion performance, and smart features.