QD-OLED beats LG panels on brightness without resorting to tricks (WOLED uses white pixels to increase brightness). Seeing them side by side with images of shiny metals such as gold, QD-OLED just looks far better.
There's a reason Sony use QD-OLED panels in their top-of-the-range TV's.
Sony are actually dumping QD-OLED for Mini LED for their top-of-the-range TVs in 2024, because they don't think QD-OLED is bright enough either, in the context of new 4000-nit mastering monitors.
Because Samsung TVs deliver 90% of the quality at half the price. There's a reason basically every single major TV reviewer put the x95c as the TV of the year in 2023. LG and Sony eke out minor quality victories at massively increased prices. I do miss my Sony up-scaling quality for the odd old show I watch. The Samsung is noticeably bad here.
If I could have purchased the LG G3 77" around Black Friday timeframe last year for cheaper than the Samsung I absolutely would have. I really wanted to go with the G3, but was around a $1,200 difference that was hard to justify for the bump in quality.
At least a few years ago, it was cheaper for me to buy an 55" LG OLED TV than a comparable Samsung model in the US, and that was factoring in the Samsung employee discount I had at the time.