Which is better for gaming?

The LG C6. It runs 120Hz native with VRR up to 165Hz and the newer processor cuts input lag and motion blur. The Samsung S90C also does 120Hz on four HDMI 2.1 ports, but it lacks the higher VRR ceiling.

Which has the better picture?

The Samsung S90C is brighter and more saturated thanks to its QD-OLED layer, which reviewers praise for HDR highlights. The LG C6 is more accurate out of the box and handles dark scenes and upscaling better.

Is the LG worth stepping up to over the Samsung?

Yes if you want the current generation, longer smart-platform support and stronger gaming features. The Samsung only wins if the 65-inch size matters more than the newer hardware.

Both use OLED panels with similar lifespans, but the LG C6 is a 2026 model, so it will receive webOS updates and app support for years after the 2023 Samsung S90C stops getting them.

Which is better for a bright room?

The Samsung S90C. Its QD-OLED panel pushes higher brightness, so reflections and daylight wash out the picture less. The LG C6 is better in a dark room.

Do both support 4K 120Hz on consoles?

Yes. Both have HDMI 2.1 ports and 120Hz panels, so PS5 and Xbox Series X run at 4K 120Hz on either. The LG adds VRR up to 165Hz for PC use.

LG OLED55C66LB OLED evo C6 55" TV vs Samsung S90C 65" OLED TV

The LG C6 is the better TV: a current 2026 OLED evo panel with the Alpha 11 Gen 3 processor, four HDMI 2.1 ports, 120Hz native with VRR up to 165Hz, and 40W 2.2 audio. The Samsung S90C is a 2023-generation QD-OLED, and reviewers rate its brighter, more saturated color highly, but it is two generations old and its Tizen app support will age sooner. Buy the LG for a smaller room or a gaming setup; buy the Samsung if you want the bigger 65-inch screen and accept older hardware.

Choose the LG C6 if you sit close, game on a console or PC, or want the newest panel, processor and webOS updates.
Choose the Samsung S90C if you want a 65-inch OLED for a larger room and do not need the latest generation.

Prices

LG OLED55C66LB OLED evo C6 55" TV: $607.00 at waxvinylcartel (checked today)