Which is better for gaming?

The LG G5. Its 165Hz panel and glare-free coating give smoother motion and fewer distractions than the Sony's 120Hz screen. Both support VRR and have four HDMI ports.

Is the Sony worth stepping up to for the bigger screen?

If you sit more than about 8 feet away, yes. The 65-inch Sony fills more of your view than the 55-inch LG, and the picture quality is comparable OLED.

Which handles a bright room better?

The LG G5. Its anti-glare coating is designed to cut reflections, while the Sony's screen shows bright sources with little diffusion.

Which smart TV system is better?

Google TV on the Sony has a wider app library and easier casting from phones. LG's webOS is fast and simple but has fewer apps.

Do both support wall mounting?

Yes. The Sony lists a 300 x 300 mm VESA pattern; check the LG's pattern before buying a bracket, since it is not listed here.

Both are OLED and should last similarly with normal use. Neither brand publishes a clear edge on panel lifespan, so buy on size and features.

LG G5 Series OLED evo 4K TV (55") vs Sony BRAVIA XR8B OLED 4K Google TV

The LG G5 is the better pick for gamers and bright rooms: its 165Hz panel, glare-free coating and Wi-Fi 6E beat the Sony on motion and reflections. The Sony XR8B wins on size, giving you 65 inches of OLED in the same class of picture quality, and its Google TV platform is the more flexible smart system. Both are OLED with infinite contrast and four HDMI ports; the LG leans toward speed and anti-glare, the Sony toward screen area and Google's app ecosystem.

Choose the LG G5 if you sit close, game at high frame rates, or have windows and lamps that reflect off the screen.
Choose the Sony XR8B if you want the bigger 65-inch picture and prefer Google TV with its wider app and casting support.

Prices

Sony BRAVIA XR8B OLED 4K Google TV: $1,698.00 at Walmart (last seen Nov 10)