Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Intex LED-4010 features a 40 Inch (102 cm) screen while Intex LED-3900 comes with 39 Inch (99 cm), which can make a noticeable difference depending on your room size and viewing distance. Both models support 1920 x 1080 resolution, ensuring sharp picture quality with detailed visuals for movies, shows, and gaming. Intex LED-4010 and Intex LED-3900 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. Both TVs come with smart platforms that support popular streaming apps and voice control features. 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. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions.

Verdict: Choosing between Intex LED-4010 and Intex LED-3900 depends on your usage, whether you prioritize display quality, smoother motion, or smart features.