Wow, those poll results. It's strange. I suppose XenoBot members are a horrible pool of individuals to collect data from. According to several sources, the iPhone is still the most popular phone in the world, with more than 500 million sold (worldwide) as of June 2014 (all iPhone models up to 5C & 5S).
The iPhone 6 & 6 Plus are expected to be the most sold iPhone's yet (
http://www.theverge.com/2014/10/20/7...-2014-earnings). In one quarter, they sold nearly 40 million phones. That's approximately 3 months.