Sony X900H or X950H. Which one should I buy?
Short answer: X900H for gamers. X950H for everybody else.
Gamers should get the X900H for Variable Refresh Rate.
We recommend the X900H for avid video gamers who want to utilize their next gen console's VRR (variable refresh rate) capabilities. This feature allows real time adjustment of the TV's refresh rate to the constantly changing frame rates of video game consoles. You know when the frame rate slows down when there's a lot of action on the screen? VRR can minimize the judder by synchronizing the TV's refresh rate to the video game's frame rate.
Auto Low Latency Mode is a must-have for gamers.
According to Sony, ALLM (auto low latency mode) automatically adjusts the X900H to operate with as low as 7.2ms input lag. This rivals some of the best gaming monitors and only a few TVs can match this speed. If you are a competitive gamer, this should be another key reason to upgrade to the X900H.
What about 4K at 120Hz?
We don't think games running 120fps at 4K will be widely available on the PS5 and new Xbox Series X and S. It shouldn't be the main reason to get the X900H or any HDMI 2.1 capable TV. Most games will max out with a locked frame rate of 60fps at 4K, which any Sony TV can handle with an HDMI 2.0 connection.
X950H is better for the rest of us.
If you don't play video games, then the X950H is the better TV. Shows and movies are only shot in 24fps, which means you will have no use for 4K @ 120Hz. VRR is a gaming feature that you will also never use. If you can forego these features, the X950H gives you better color, white balance, higher peak brightness and improved local dimming.
The single HDMI 2.1 feature that matters.
X950H has one HDMI 2.1 feature that actually has a practical use for the rest of us--eARC (enhanced Audio Return Channel). This allows support for lossless 5.1 and 7.1 audio for your ARC setup, which will improve your surround sound experience significantly. Sony has included this feature in their X950G and other 2020 models, so it shouldn't be the sole reason to upgrade to the X950H.