Which is better for a bright living room?

The C6. Its evo panel with Brightness Booster fights glare better than the standard OLED panel in the B5.

Which is better for gaming?

The C6. It adds 165Hz VRR, a 0.1ms response time and four full HDMI 2.1 ports. The B5 still handles 120Hz console gaming well.

Is the bigger B5 worth choosing over the C6?

If you sit more than about 8 feet away, yes. The extra 10 inches is more noticeable than the brightness and processor gap.

Both use LG OLED panels with similar lifespans. The C6's newer processor and webOS 26 should receive updates longer.

Do both support Dolby Vision and Dolby Atmos?

Yes. Both handle Dolby Vision, HDR10 and HLG, and both decode Dolby Atmos audio.

Which has better sound out of the box?

The C6. Its 2.2 channel 40W system produces more bass and width than the B5's built-in speakers.

LG C6 Series OLED TV vs LG B5 Series 65" OLED TV

The C6 is the better TV: a brighter evo panel, the newer α11 Gen3 processor, 165Hz VRR and a newer webOS. The B5 wins on size, giving you 65 inches for a similar outlay, and its OLED picture is still excellent. Buy the C6 if picture quality and gaming headroom matter most; buy the B5 if you sit far away and want the bigger screen.

Choose the LG C6 if you want the brightest, most future-proof OLED with the fastest gaming features and the latest processor.
Choose the LG B5 if you want a larger 65-inch OLED screen and can accept slightly lower brightness and a step-down processor.

Prices

LG C6 Series OLED TV: $899.00 at Greentoe (checked today)
LG B5 Series 65" OLED TV: $917.00 at Walmart (checked today)
Difference: the LG C6 Series OLED TV is $18.00 cheaper than the LG B5 Series 65" OLED TV today