Which is better for gaming?

The LG C5. It has four HDMI 2.1 ports, a native 120Hz panel that reaches 144Hz on PC, and VRR. The Samsung S90H listing does not state its refresh rate or HDMI version.

Which has the better picture?

Both are OLED with per-pixel contrast. The LG adds Brightness Booster and Dolby Vision, and owners praise its brightness and color. The Samsung's HDR format is not stated, so Dolby Vision content is a point for the LG.

Is the Samsung worth saving $2?

Only if you want the 42-inch size or built-in Alexa and Google Assistant. Otherwise the LG's extra ports, Dolby Vision and longer update promise are worth more than $2.

Which is better for a bright room?

The LG C5. Its Brightness Booster raises output, and owners say the high brightness makes the picture pop. The Samsung listing gives no brightness figure.

The LG C5 is promised up to 5 years of webOS updates through webOS Re:New. Samsung states no update window for the S90H. OLED panel life is similar for both.

Do either need a sound bar?

LG C5 owners say its sound is good enough without one. The Samsung S90H listing gives no audio details, so budget for a bar if sound matters.

LG OLED evo AI C5 4K Smart TV vs Samsung S90H 42" OLED 4K UHD Smart TV

Both are 4K OLEDs with near-identical prices: $899.99 for the LG C5 at Walmart and $897.99 for the Samsung S90H at B&H Photo-Video-Audio, both as of November 4, 2026. The LG C5 is the better pick for most people: it has four HDMI 2.1 ports, 144Hz, Dolby Vision and Dolby Atmos, and a larger, well-documented owner base. The Samsung S90H is the pick if you want a 42-inch OLED, need Google Assistant or Alexa built in, or want the lowest price of the two.

Today the Samsung S90H 42" OLED 4K UHD Smart TV costs $321.13 less at its best price.

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