Some good is starting to come out of the Apple vs Samsung legal battle. For instance, this survey that was released in the court documents shows the major reasons that customers chose an Android phone over an iPhone. Curiously enough, the reason given most was that people didn't want to change their carrier.
Looking at the numbers, it appears that AT&T's iPhone exclusivity damaged sales of the phone as people didn't want to jump ship to the carrier. They instead chose to purchase an Android, possibly resulting in a larger uptake of the operating system. The second largest reason, 36%, was that users trusted the Google brand.
43% Wanted to stay with current provider
36% Trusted Google brand
30% Preferred larger screen
27% Preferred Android Market
26% Wanted better Google services intergration
25% Wanted latest and greatest smartphone
25% Wanted turn-by-turn GPS
25% Wanted latest and greatest technology
Interestingly, the features that have come to be known as defining differences, bigger screen, latest and greatest technology, didn't turn up as high as other answers. They rang in at only 30% and 25%, respectively. The survey also indicates that 25% of Android buyers considered an iPhone. This group of people should be the respondents to this survey.