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.
Are 240Hz Monitors Good for Gaming and Worth the Upgrade?
What is the Refresh Rate? 60Hz vs 120Hz
What Is A TV Refresh Rate? 60Hz vs 120Hz
StarTech.com USB 3.0 to Dual DisplayPort Adapter 4K 60Hz, DisplayLink Certified, Video Converter with External Graphics Card - Mac & PC (USB32DP24K60), Black : Electronics
60Hz vs 120Hz For TVs - Is It Worth The Upgrade? [Simple]
60Hz vs 120Hz Screen - Difference and Comparison
60Hz vs 120Hz For TVs - Is It Worth The Upgrade? [Simple]
60Hz vs 120Hz LED TV in Slow Motion
60hz Vs 120hz for Tvs – is It Worth the Upgrade?
iPhone 15 review: I spent a month with Apple's base model and found it more 'Pro' than ever