Of the 4 family members I have who own an Iphone (4 and 5s), 3 of them are broken in some way! Two dropped and cracked the glass, and the other, I don't know wtf happened to it but the aluminum on the back is all bent inward so that phone only works some of the time. I cant say Android phones have been better as frankly I'm the only one who owns one (my wife is more a tablet person, she has a Nexus 10).
You small sample will have a very very low confidence interval. The authors of the study in the article have access to way more data points, and their results will have much greater confidence.