An interesting part will be watching the numbers as the younger people get older.
The rich and college educated people are going to be heavily weight at the iPhone.
My read of that is iPhone is going to start dropping as those 18-24 year olds start getting older and richer. Also means more of them will have college degrees so it going to change the balance by quite a bit.
They will of course change there preference to iPhone as they get older and smarter.
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I know some fairly well off people with Samsungs. It's all a matter personal preference really.
I'll bet that's a large sample.
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The survey is somewhat skewed. It compares the product of one manufacturer with the products of many manufacturers.