OLED’s are hands down the best right now, obviously with that budget you also want to go with 4K resolution. The QLED’s are good, but they don’t compare in my opinion. Main reason being the technology in the QLED isn’t as sophisticated, something to do with how often the pixels have to open and shut to emit light or something along those lines... therefore they don’t produce nearly the black levels or the contrast as the OLED.
The QLED however is a touch brighter, but for overall clarity and picture quality definitely stick with OLED. Really, it’s hard to go wrong with Samsung or Sony. The new Sony’s look amazing on display. And If you want something that’s quality and a bit more on budget LG makes a great panel.