Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Panasonic TH-42JS660 and Elista LED-SU43ECA69 differ in resolution (1920 x 1080 vs 4K 3840 x 2160), which can affect overall clarity and sharpness of the display. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Panasonic TH-42JS660 features a 42 Inch (107 cm) screen while Elista LED-SU43ECA69 comes with 43 Inch (109.22 cm), which can make a noticeable difference depending on your room size and viewing distance. Overall, both models are capable choices in their segment, offering a balance between performance, features, and usability. Panasonic TH-42JS660 and Elista LED-SU43ECA69 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Both TVs come with smart platforms that support popular streaming apps and voice control features.

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