One thing to remember is that Samsung Display's QD-OLED panels are a 1st gen panel vs. LG Display's more mature panels. TBH if you haven't had an OLED tv before, you won't be disappointed by either; the other QOL stuff might give you cause though and the LG wins out there.
Personally I'm excited for QD-OLED as a technology and look forward to it baking a little bit longer. If I was specifically going to be buying a QD-OLED TV today though, I'd only be looking at Sony's A95K as it removes a lot of the downsides IMO: Android TV, Dolby Vision support, picture processing is superior IMO. I don't mind giving Samsung Display my money but I refuse to give Samsung Electronics any more.