Is the 42-inch S90H good for gaming?

Yes. It has four HDMI 2.1 ports, 4K at up to 144Hz, VRR and low input lag, which suits PS5, Xbox Series X and PCs. The small size also works well as a desktop monitor.

Does it support Dolby Vision?

No. It handles HDR10 and HDR10+ but not Dolby Vision, so Dolby Vision discs and streams fall back to HDR10. LG and Sony OLEDs in this size do support it.

Is 42 inches too small for a living room?

It suits bedrooms, studies and small living rooms where seating is close. For a main room with a sofa several feet back, a 55-inch or larger set is usually better.

Can OLED burn-in happen on this TV?

It can with repeated static content such as news tickers, channel logos or a desktop taskbar. Vary content and use the screen-off and pixel-shift features to lower the risk.

Do I need a soundbar?

The built-in speakers are thin, so a soundbar or speakers improve dialogue and bass. If you mostly watch quiet dramas at low volume, the built-in audio is usable.

How does it compare with the LG C-series?

Both are 42-inch OLEDs with four HDMI 2.1 ports. The Samsung adds anti-glare coating and HDR10+, while the LG adds Dolby Vision and tends to be a popular reference for movie watching.