Give the LG G3 OLED the best possible source material and it'll reward you with the best possible viewing experience. Traditional OLED picture quality doesn't get better or brighter than this ...
Both are available in the same sizes, too, although you'll need to buy the 55-inch ... in August 2023 by LG, the M3's official pricing isn't wildly different to that G3. That could make this ...
However, the G4 only offers a minor upgrade in color and brightness performance, so the cheaper G3 is still the better buy for wall mounting. Check out my full LG G4 TV review for more details.
OLED evo TVs promise even better picture and more brightness, although none of them will include MLA technology.