You are not comparing technologies, but marketing gimmicks.

Both GS and N9 have polarizing filters, just Samsung does not advertise it.
Also Nokia also has striped RGB screens (E7) but they don't advertise it.

They chose pentile because they can't fit so many pixels in 3.9 inches with stripe (that's why SGS2 is .3 inches bigger)

Brightness is superior for the N9 (second brighter AMOLED phone after X7)

The N900 is about two times darker than the N9 and iPhone 4 but go out in direct sunlight and compare them. (spoiler, they have about the same visibility - the reason I will leave as a quiz)

There is much on screen technologies going on, and finally it boils down to a matter of preference because there is a spectrum of possible things and most manufacturers just pick the point they like. Top 2011 phones simply can't be compared in screen technology



every one of them is great in one spec and low in others or about average everywhere.

(only the Lumia 800 is kind of low everywhere)