Which is better for gaming?

The LG C5. It has four HDMI 2.1 ports, VRR and a 0.1ms response time. The Roku has 120 Hz but only two HDMI ports and no listed VRR.

Which has the better picture?

The LG C5. OLED gives per-pixel contrast and the alpha 9 processor handles upscaling and motion better. The Roku's QLED is bright and colorful but trails on processing.

Which is better for a bright living room?

The LG C5 has an anti-glare coating and wide viewing angle, which helps in bright rooms. The Roku's larger 65-inch screen suits a big wall but its processing is less refined.

Is the LG worth stepping up to over the Roku?

If you game or care about contrast and processing, yes. If you mainly stream and want the biggest screen with the simplest interface, the Roku is the easier fit.

Both are built to last years. OLED panels can dim over time with static content, while LCD panels like the Roku's avoid that risk but offer less contrast.

Roku Pro Series OLED TV vs LG C5 48-Inch OLED TV

The LG C5 is the better TV for picture quality and gaming: its alpha 9 processor, four HDMI 2.1 ports and 0.1ms response time beat the Roku on processing and connectivity. The Roku Pro Series wins on size and simplicity, giving you a 65-inch screen and the fastest, easiest smart interface for a living room where streaming matters more than console gaming. Owners of both praise vivid picture and easy setup, but the Roku's weaker sound and two HDMI ports are real limits if you have a soundbar, console and streaming stick.

Choose the Roku Pro Series if you want the biggest screen for a family living room and value a simple, snappy interface over top-tier processing.
Choose the LG C5 if you game, watch in a bright room, or want the best processing and four HDMI 2.1 ports in a smaller, sharper package.

Prices

Roku Pro Series OLED TV: $429.00 at Amazon (last seen Nov 12)