One drives innovation and competition, the other is total control and oppression. IE Android vs Apple!
Polar opposites. One works with cooperative system of production and distribution organized to directly satisfy economic demands and human needs. They offer a wider selection and choice, which to some means greater confusion.
The other is where one body inflicts total control and oppresses any conflicting ideas in their aim to control and supply what they feel is required. It minimizes choice and hence makes the final decision simpler. Choice of one!
This appeals to two very different types of people, many of which have strong ideas and values with regards to their own ideals. Just like different religions!
Secondly, no one likes to be told they just made a bad decision, or wasted their money, whether it be true or not!