Which oled tv?

I would like to buy an oled TV (or one with true black). Size 65 or 75 inches… Starting material is usually 4k netflix. I would like one with excellent sharpness and contrast.

Do you have any tips which is the best in terms of price-performance?

Price / performance is usually best with LG. The other manufacturers also buy the panels from LG. But the processor and how the manufacturers use the panels also make a big difference. I would say that Sony usually offers the best picture, but also charges one of the highest prices for it.