The advantages of the higher resolution are not only that it gives you more working area, but it's also ideal for displaying full HD (1080p) content.
Going above 24in, the dot pitch also goes up, meaning your images are no longer as sharp. Meanwhile, adjustability goes down, with only rare cases offering pivot or even height adjustment.
Of course, taking things to the next level, you could go for a 30in screen, but these severely tax both your wallet and your graphics card, and use up to twice as much electricity.
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