Hmmm I wonder what the actual best display actually is. I'm no expert but from reading tv reviews in the past usually the warm setting had more yellow whites and was always considered to be the most accurate as a starting calibration point. Whereas the cool setting was usually considered to be the most inaccurate YET most pleasing to the eye of the average consumer.
This is why TVs in stores on display are set to have very bright bright images with very cool color temperatures, what some refer to as torch mode.
To be honest I think my 6S plus display is great. But putting next to my iPad Air 2 just now I can see the whites are more on the warm side than my iPad. Doesn't bother me, I didn't even notice until I compared.
Haven't looked through this whole thread. Has anyone measured which one displays colors more accurately I believe to the 6500 level??
You're correct about this. 6500k is considered a neutral standard, but most people would look at a perfectly calibrated 6500k display at the standard 120 lumens and think it was dull and yellow.