Which is better for gaming?

The LG C6. It has a 120Hz native panel, VRR up to 165Hz, G-Sync and FreeSync Premium, ALLM, and four HDMI 2.1 ports. The Samsung listing states no refresh rate or VRR support.

Which has better picture quality?

Both are OLED, so both give true blacks and wide viewing angles. The LG adds an evo panel with Brightness Booster and Dolby Vision, which the Samsung listing does not confirm.

Is the Samsung worth stepping up to?

Only if 42 inches is the size you need. The LG is the better-specified TV overall, with more ports, higher refresh and confirmed HDR formats.

Neither listing gives a panel lifespan. LG includes OLED Care features to reduce burn-in risk. OLED care habits, like avoiding static logos, matter more than brand here.

Which is better for a bright room?

The LG's Brightness Booster helps OLED hold up in brighter rooms. The Samsung listing gives no brightness figure, so compare them in person if your room gets a lot of sun.

Do both support streaming apps?

Yes. Both are smart TVs with 4K resolution. The LG runs webOS 2026 with Netflix, Prime Video, YouTube, HBO and Disney+ plus 400+ free channels.

LG OLED evo C6 55" 4K Smart TV vs Samsung S90HA OLED 4K Smart TV

The LG C6 is the stronger TV of the two. It is a 55-inch OLED evo with a 120Hz native panel that reaches 165Hz VRR, four HDMI 2.1 ports, Dolby Vision, and a 2.2-channel 40W speaker system. The Samsung S90H is a 42-inch OLED with the same 4K resolution and smart features, but its listing gives no refresh rate, processor, HDR format, or port count. Buy the LG for a main room and serious gaming. Buy the Samsung only if a smaller 42-inch OLED fits your space.

Choose the LG C6 if you want a 55-inch OLED with 120Hz gaming, four HDMI 2.1 ports, Dolby Vision, and strong built-in sound.
Choose the Samsung S90H if you need a smaller 42-inch OLED and can confirm its gaming and HDR specs before buying.

Prices

LG OLED evo C6 55" 4K Smart TV: $949.00 at Greentoe (last seen Nov 10)