Both TVs provide standard built-in audio performance suitable for regular usage, though external speakers can enhance the experience. Intex LED-3900 features a 39 Inch (99 cm) screen while Sansui SJX40HB21CAF comes with 40 Inch (102 cm), which can make a noticeable difference depending on your room size and viewing distance. In general, both TVs cater to modern entertainment needs, including streaming, gaming, and everyday viewing. If you're comparing Intex LED-3900 and Sansui SJX40HB21CAF, both models come with modern features and are designed to deliver a solid viewing experience across different use cases. Intex LED-3900 and Sansui SJX40HB21CAF differ in resolution (1920 x 1080 vs 1366 x 768), which can affect overall clarity and sharpness of the display. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Both TVs come with smart platforms that support popular streaming apps and voice control features.

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