The image quality on the smaller Led TV can often look sharper and more vivid, and that's because of its pixel density. This is measured in PPI (Pixels Per Inch). So, the smaller screen will have a higher number of pixels per inch than the larger screen.

The X9000 series is currently the most suitable TV for PS5 with 4K/120FPS supported. That explains the high demand for it.

Haha..for your room I think 55 is adequate enough. For 65' you need to sit much further than with a 55'. i think the X90H is too hot in demand now. Going to wait for the stocks and the price to cool down first.