If you are a competitive gamer or if you have hardware that can run ~120FPS, you should invest in a 120Hz TV. Otherwise, it's not necessary.
60Hz vs 120Hz:What is the Refresh Rate?
60Hz vs 120Hz For TVs - Is It Worth The Upgrade? [Simple]
TV Refresh Rates Explained: 60Hz, 120Hz, and Beyond
60Hz vs 120Hz Screen - Difference and Comparison
60Hz vs 120Hz For TVs - Is It Worth The Upgrade? [Simple]
TV Refresh Rates Explained: 60Hz, 120Hz, and Beyond
What is the Refresh Rate? 60Hz vs 120Hz
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60Hz vs 120Hz TVs: which refresh rate should you buy?
What is the Refresh Rate? 60Hz vs 120Hz
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Why 120Hz Is Better Than 60Hz : The Best Gaming TV Experience