Re: OLED FTW?
The advantages of OLED stem from pixels being lit individually, so the blacks are perfect black, and displaying a small amount of text on a black screen uses very little battery.
LG OLED televisions have mostly solved issues with burn-in by tweaking the control circuitry. The OLED TVs are just beautiful, but cost about 4x as much as an equivalent 4K television set. Their phones, which use a polymer rather than glass substrate, evidently haven't.
The other advantage of OLED is that it allows for flexible displays. Samsung are promising to release a couple of such phones next year.