Panasonic TH-50HX450 features a 50 Inch (126 cm) screen while Panasonic TH-49GX655DX comes with 49 Inch (124.46 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. Both TVs come with smart platforms that support popular streaming apps and voice control features. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. From a practical standpoint, both options provide a reliable viewing experience for most users. Panasonic TH-50HX450 and Panasonic TH-49GX655DX 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.

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