The people cannot choose the system that they want to get in. It is the society that will choose the people who's in and out. This is the sad reality, even if you're trying hard and working at your best.
There's inequality that can be found in the social status of everyone. But if you're living in a fair system, whether you'll be the rich guy, middle class or poor guy. As long as there's an equal share for opportunity, that would be the ideal system.
That is obvious. If you are staying in a capitalist country such as the United States, then you can't demand that the country should implement socialist policies (politicians such as Bernie Sanders want to do that, but I really doubt whether he will be allowed, even if he gets elected as the president of the United States). Similarly, if you are residing in a country such as North Korea, then you need to put up with the Socialist system. Most likely you will end up in abject poverty, and may only be able to have food once a day. On the other hand, Kim Jong Un and the ruling elites will be munching on imported Beluga caviar and parmesan cheese. You can't demand that a capitalist system should be implemented there. If you do that, most probably you will end up dead along with your family members.