I know most folk here are opposed to deckHD but hear me out. If you are mainly a moonlight and chiaki4deck guy the 1200p might rival the OLED for the sheer resolution benefits. Not to mention the inherent awesomeness of 5hr sessions with only 8w power consumption from streaming.
You can just stream in higher resolution (super sampling) and the screen quality of the OLED panel on top of that will definitely look much better than the native higher resolution of DeckHD.