There are a couple of factors you should think about—distance from the TV, Number of people watching the TV, Viewing Angles, and Screen Resolution.  Viewing distance (in inches)/2 = recommended TV size. If there are too many people watching, getting a bigger TV of at least 40 inches makes sense. Those who want to make sure the sharpness and distortion stay at the minimum look for a UHD/4K TV. The large the TV, the higher the resolution should be.