A double blind test would be impossible. Anyone would know what is MacOS and what is Windows and what is Linux.
I say let a thousand apple blossoms bloom, and Windows open, and penguins strut. If Apple cannot keep a clientele that is Apple’s headache, not a headache that Joe Blow on the street ought to worry about.
This is the American Customer Satisfaction Index. They survey 80,000 people on questions relating to dozens of markets and industries, spanning hundreds of companies and even the government. Consumer electronics is only a tiny part of the overall survey. And they've been doing this since long before Apple was in the phone or music player business. So much for the fanboi theory.
What will really kill you is that not only does the iPhone rank highest now, it ranks higher than anyone ever did in the history of the survey before the iPhone was released. Nobody else, even Nokia in their heyday, has ever broken 80. And Apple's still there above 80, far ahead of the nearest competition.
But don't let the facts ruin your fanboi conspiracy theory.
But, Apple would never let that kind of study occur
Apple doesn't have to let such a study happen. Anybody can do it. Samsung tried something like that with the Note, but it didn't go over too well. I think the extreme cherry-picking of included capabilities that were freely downloadable for the iPhone anyway was just too obvious.