Two OLEDs, one price

In LG C6 vs Samsung S90H, the LG C6 65-inch is the better buy for most UK homes and the Samsung S90H 65-inch is the better buy for a bright room. The two 2026 OLEDs share a WOLED panel type, a 165 Hz top refresh rate, four HDMI 2.1 ports and a £2,099 Amazon UK price at the time of writing (September 2026). The LG C6 wins on Dolby Vision and black depth in a dim room; the Samsung S90H wins on reflection handling and HDR power draw.

The comparison rests on manufacturer specifications, EU energy label data, named independent measurements and UK pricing. Both sets also feature in Best 65-inch TV UK 2026, where the LG C6 is the overall pick.

LG C6 vs Samsung S90H spec comparison

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65" OLED

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65" OLED

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The 2026 Samsung S90H uses a WOLED panel at every size, so the 65-inch model is the same panel type as the LG C6. That is a change from the 2025 Samsung S90F, which used QD-OLED at 65 inches. Buyers who want Samsung's QD-OLED at 65 inches need the Samsung S95H, which listed at £2,599 on Amazon UK at the time of writing.

Which is brighter, the LG C6 or Samsung S90H?

The Samsung S90H and LG C6 are close enough in brightness that neither wins outright. ecoustics measured a 55-inch Samsung S90H at 1,553 nits on a 10% HDR window in Filmmaker Mode and 292 nits full-screen. Expert Reviews measured a 65-inch LG C6 at just under 1,500 nits on the same 10% window in Filmmaker Mode and about 263 nits full-screen. The measured gap of around 4% on highlights and 11% on full-screen white sits below what most viewers notice side by side.

Two caveats apply. The measurements come from different sizes, and OLED brightness varies slightly by panel size. Samsung says the S90H is around 15% brighter than the 2025 S90F, while the LG C6 65-inch uses LG's standard WOLED panel; LG keeps its brighter Primary RGB Tandem panel for the 77-inch and 83-inch C6. Buyers who want a clearly brighter OLED should look at the LG G6 or Samsung S95H instead.

Which handles reflections better?

The Samsung S90H handles reflections better. Samsung's Glare-Free matte coating spreads the light from a window or lamp across the screen, so a bright reflection turns into a soft haze rather than a mirror image. The LG C6 uses a glossy screen, which shows reflections clearly but keeps blacks inkier when the room lights are off.

The trade-off is black depth in a lit room. Tom's Guide found that in average to bright lighting the S90H's matte finish lifts dark areas towards a grey tone, because the diffused light sits across the whole panel. For a lounge watched mostly in the evening with the lights low, the LG C6 looks richer. For a south-facing room used in daylight, the Samsung S90H is the more watchable screen. The OLED vs QLED guide covers how both compare with brighter LCD sets.

Which is better for PS5 and Xbox gaming?

The LG C6 and Samsung S90H are equally good for PS5, and the LG C6 is slightly better for Xbox Series X. Both 65-inch sets run at up to 165 Hz with VRR, support ALLM and have four HDMI 2.1 ports, so a PS5, an Xbox Series X and a gaming PC can all connect at 4K 120 Hz without swapping cables. The PS5 outputs games in HDR10, which both TVs support, so neither HDR format gives an advantage on PlayStation.

The Xbox Series X supports Dolby Vision gaming, which the LG C6 handles and the Samsung S90H does not. Samsung answers with HDR10+ Gaming, FreeSync Premium Pro and the Gaming Hub for cloud gaming without a console. A PC gamer running at 144 Hz or 165 Hz gets the same headroom on both. For a wider shortlist, see Best TV for PS5 and Xbox Series X.

Does Samsung's lack of Dolby Vision matter?

Samsung's lack of Dolby Vision matters a little, not a lot. Netflix, Disney+ and Apple TV+ stream many titles in Dolby Vision, and on the Samsung S90H those titles play in HDR10 with static metadata instead of scene-by-scene data. Samsung's processor applies its own dynamic tone mapping to HDR10, which narrows the gap. Amazon Prime Video streams in HDR10+, which the Samsung S90H supports and the LG C6 does not.

Dolby Vision matters most on a TV that struggles with brightness, because the metadata tells it how to squeeze highlights down. A 1,500-nit OLED has less to squeeze, so the visible difference on the S90H is smaller than on a budget LCD. Buyers with a large 4K Blu-ray collection, most of it mastered in Dolby Vision, should still lean towards the LG C6.

Which has the better smart platform and warranty?

The Samsung S90H has the longer software promise, and the LG C6 has the stronger UK panel cover. Samsung commits to seven years of Tizen upgrades on the S90H, two more than the five years LG offers on webOS 26 through its webOS Re:New programme. Both platforms carry BBC iPlayer, ITVX, Channel 4, Netflix, Disney+, Prime Video and Apple TV+, and both support AirPlay 2, so app choice is not a deciding factor.

The LG UK product page lists five years of OLED Care+ panel cover on the LG C6 on top of the standard 12-month warranty, which covers the burn-in risk every OLED carries. The Consumer Rights Act gives buyers of either set up to six years to claim for a fault that existed at the time of sale, but the burden of proof shifts to the buyer after six months, so written panel cover is worth more than it looks.

The Samsung S90H weighs 19.1 kg without its stand against 16.6 kg for the LG C6. Both are light enough for a standard wall bracket rated at 25 kg or more. Samsung's Object Tracking Sound Lite and LG's built-in Dolby Atmos processing both sound thin next to a soundbar, so budget for one with either TV.

Which costs less to run, the LG C6 or Samsung S90H?

The Samsung S90H costs less to run in HDR and the same in SDR. The figures below use each set's EU energy label on-mode power, four hours of viewing a day (1,460 hours a year) and the Ofgem price cap unit rate for 1 October to 31 December 2026 of 26.32p per kWh. A TV's on-mode power in watts equals its label figure in kWh per 1,000 hours.

Compare Electronic's yearly energy cost comparison

The finding is that SDR costs match within 15p a year, and the gap only opens in HDR, where the Samsung S90H draws 34 W less. A household watching a quarter of its viewing in HDR saves £3.15 a year with the Samsung S90H, and one that watches everything in HDR saves £13.06 a year, or £65.30 over five years. That is real money but small beside a £2,099 purchase, so energy use should break a tie, not decide the choice. Brighter picture modes raise both figures.

Which should you buy at UK prices?

At 65 inches, the LG C6 is the one to buy for most rooms, because it costs the same £2,099 as the Samsung S90H on Amazon UK at the time of writing (September 2026) and adds Dolby Vision for no extra money. At 55 inches the sums change: the Samsung S90H 55-inch cost £1,499 against £1,599 for the LG C6 55-inch, so the Samsung saves £100 at the smaller size.

The Samsung S90H becomes the better buy in two cases: the room gets direct daylight on the screen, or its price falls below the LG C6. Both sets launched in spring 2026 and are likely candidates for autumn discounts; the Black Friday TV deals UK 2026 guide sets out how to check a deal against today's prices. Buyers who want a bigger screen for the same money should read Best 85-inch TV UK 2026, and those curious about the newest backlight technology, RGB LED vs OLED.

Verdict

The LG C6 65-inch is the better OLED for most UK buyers: Dolby Vision and deeper blacks in a dim room for £2,099. The Samsung S90H 65-inch is the better OLED for bright rooms, with a Glare-Free matte screen, HDR10+, seven years of Tizen upgrades and £13 a year lower HDR running costs. On brightness, gaming and price, the two are a tie. For every size and budget, see Best TV UK 2026.