Which is better for gaming?

The Acer. Its 144Hz refresh rate gives smoother motion than the Panasonic's 60Hz, which matters for fast-paced games.

Which has better sound?

The Acer lists 60 W output with Dolby Atmos and a woofer-tweeter setup. The Panasonic's audio specs are not detailed, so the Acer is the safer bet for built-in sound.

Is the Panasonic worth stepping up to?

Only if you value the Panasonic name and built-in Google Assistant over refresh rate and audio. On motion and sound, the Acer offers more.

Which is better for a wide room?

The Acer, thanks to its 178-degree viewing angle. The Panasonic does not list a viewing angle, so off-center seats are less certain.

Do both run Google TV?

Yes. Both are Google TV sets with voice control, and both list Netflix among their streaming services.

Panasonic W85C 75" QD-Mini LED Google TV vs Acer M Series 75" 4K Mini LED Google TV

Both are 75-inch 4K Mini LED Google TVs, but they are built for different buyers. The Panasonic W85C is a 60Hz QD-Mini LED set with Google Assistant built in and three HDMI ports; the Acer is a 144Hz Mini LED set with a 178-degree viewing angle, Dolby Atmos audio and far more connectivity. For gaming and sports, the Acer's higher refresh rate is the clear advantage. For a simpler, assistant-led living-room TV, the Panasonic is the more focused pick.

Choose the Panasonic W85C if you want a straightforward 75-inch QD-Mini LED Google TV with Google Assistant built in and you do not need a high refresh rate.
Choose the Acer if you watch sports or play games and want 144Hz motion, wide viewing angles and Dolby Atmos sound.

Prices

Panasonic W85C 75" QD-Mini LED Google TV: $399.99 at Amazon (last seen Nov 13)