The LG OLED B4 55 outperforms the LG NanoCell 75 NANO75 in picture quality with perfect blacks and 120Hz refresh rate per RTINGS and CNET reviews, though the NANO75 provides a much larger 75-inch screen at similar pricing. The B4 wins on contrast (infinite vs typical 2000:1 LCD) and motion clarity but trails in peak brightness for bright rooms. Size difference makes direct comparison tricky but...