Screen size measures the diagonal physical distance, while resolution counts image samples. A larger television with the same resolution spreads those samples over a bigger area. It can feel more immersive without necessarily showing more source detail than the smaller screen.
Measure the room first
Consider the viewing distance, available wall space and the height of the screen. A very large panel placed too high can be less comfortable than a smaller panel at eye level. Do not choose a size using a resolution label alone; a television is furniture as well as an electronic display.
Compare like with like
View the same programme at similar picture settings. Shop demonstration loops often use carefully selected footage, so they may not represent the channels you watch most. Lower-resolution channels can reveal compression more clearly when enlarged, while high-quality films may benefit from a larger image.
Plan for ordinary viewing
Think about subtitles, scoreboards and the room’s daylight. A larger screen can make text easier to read, but strong reflections can still spoil the result. If you already own the display, improving seating, lighting and picture settings is a useful first step before replacing a working screen.