According to a research conducted by Localytics, the iPhone 6s is selling far better than the iPhone 6s Plus in the first week of availability. The iPhone 6s has been four times more popular than its larger sibling. The two devices already account for 1.9% of all Apple smartphones currently in use, but the iPhone 6s holds 1.5%, while the iPhone 6s Plus has just 0.4%. Just a week ago, Apple set a new 13M record with the sales of the iPhone 6s and iPhone 6s Plus in their first three days of availability. In the first three days of sales, the iPhone 6 and iPhone 6 Plus managed to hit 10 million sales combined. Overall, the iPhone 6 remains Apple's most popular with 33.2% share of all Apple smartphones. Next is the iPhone 5S and iPhone 5 holding 23.2% and 11.2%, respectively....
Source: http://www.gsmarena.com/iphone_6s_is_four_times_more_popular_than_the_6s_plus-news-14303.php