Never understand these kinds of debates. The phone that "wins" is the one that works for you. As long as companies are profitable, it really doesn't matter if they sale more or less then a competitor. Honestly, do you worry about such things for other products? Do you insist that the hamburger you eat sales more then the next guy's hamburger?
I'm glad you brought this issue up. thank you.
Say there are two hamburger places right next to each other. The one on the left has few customers, and one on the right has many customers inside. Which one are you gonna go into? I don't know about you, but i'm going to the one on the right. Why? because people seek out good food. I saw some people bringing up Big Mac arguments on other sites(maybe here as well, i don't know), meaning the most burgers sold doesn't make it the best. My answer, Big Mac sells the most because it's one of the best burgers among cheap burgers. Likewise, samsung sells many cheap phones because it makes one of the best cheap phones. Samsung also makes one of the best steaks and sells many steaks, namely the S4.
I know this is not right all the time. There have been cases where the best wasn't necessarily the most popular product. However, these are far and few in between. How do I know? Look around you. Computer, desk, pen you are using, weren't they the best products for the best price for you? People seek out the best products at the best prices. This is why people pay attention to what others are buying. Is it right all the time? no, but most of the time? Yes. It's not written in stone, but it's a good place start.