People wanting choice might be why us nerds choose Android but it is not why the average the consumer does. The average consumer does not know better either way whether they would prefer iOS, Android, or other.. they just need a new phone because their old one broke and "hmm I guess this one looks ok". The average consumer gets an Android phone because they walk into a carrier store needing a new phone and ultimately end up going with the option that earns the salespeople the largest commission. And this average consumer I'm describing accounts for 95% of the market.
This effect largely doesn't apply to tablet consumers.