Which is better for a bright living room?

The Samsung S84F. Its anti-glare coating cuts reflections that the LG B4 does not specifically address, and the larger 65-inch panel holds up better at typical couch distance.

Which is better for a small bedroom?

The LG B4 at 48 inches. At close seating the smaller screen keeps pixels dense and the picture stays sharp, and it takes up far less wall space.

Do both handle gaming?

Yes. Both are 120Hz OLED panels with 4K resolution, so current consoles can run high frame rates. The Samsung gives you four HDMI ports, which is easier if you keep several devices connected.

Neither has a clear edge on lifespan. Both use OLED panels, which can show static-image burn-in over years of the same channel logos or tickers; vary content and enable screen-shift or pixel-refresh features on either.

Is the Samsung worth stepping up to over the LG?

Step up if you want the bigger 65-inch picture, anti-glare handling and more HDMI inputs. Stay with the LG B4 if 48 inches fits your room and you want Siri and Google Assistant support.

Which has better smart features?

They are close. Samsung's Tizen includes Samsung TV Plus free channels; LG's webOS is simple to navigate and supports Netflix and YouTube plus three voice assistants.

Samsung S84F 65" OLED 4K TV vs LG B4 Series OLED TV

Buy the Samsung S84F if you want a big 65-inch OLED with anti-glare coating and four HDMI ports for a bright room or a console plus soundbar setup. Buy the LG B4 if your space is small or you sit close, since 48 inches at 4K keeps pixels dense and the B4 covers the same core OLED strengths. Both are 120Hz 4K OLEDs with HDR and smart platforms; the Samsung adds glare handling and size, the LG adds a smaller footprint and broader voice-assistant support.

Choose the Samsung S84F if you have room for 65 inches and want anti-glare handling plus four HDMI inputs.
Choose the LG B4 if you sit close or have a tight wall, and 48 inches suits the room better than 65.

Prices

LG B4 Series OLED TV: $930.95 at JourneyEd (last seen Nov 1)