Both TVs come with smart platforms that support popular streaming apps and voice control features. Audio output differs between the two (2 x 8 W vs 2 X 8 W), which can influence overall sound clarity and loudness. Both TVs provide decent motion handling, making them suitable for everyday viewing including sports and action content. Sansui S55P28UA and Insignia NS-55D421NA16 are two competitive smart TVs offering a mix of display performance, smart features, and overall value for different types of users. Both TVs come in similar screen sizes, making them suitable for comparable viewing setups and room environments. From a practical standpoint, both options provide a reliable viewing experience for most users. Sansui S55P28UA and Insignia NS-55D421NA16 differ in resolution (4K 3840 x 2160 vs 1920 x 1080), which can affect overall clarity and sharpness of the display. Both TVs offer adequate brightness levels suitable for most indoor lighting conditions.

Verdict: Choosing between Sansui S55P28UA and Insignia NS-55D421NA16 depends on your usage, whether you prioritize display quality, smoother motion, or smart features.