That was probably true a decade ago, as North Koreans were effectively brainwashed. That's been changing, due to obsolete Chinese media devices getting smuggled across the border, which North Koreans buy on the blackmarket (along with other illegal stuff like, um, food). They share South Korean TV shows, and start to ask questions.
Chinese generally know what is going on in their country. They are often pretty blunt about not liking the government. But they don't generally feel oppressed, as the government only cracks down on stuff that's an existential threat to them. Try to overthrow them, and you will get oppressed. But otherwise, the government tends to be quite liberal.
OK, the government does hold huge amounts of land, which is an invisible kind of tax. They also have high taxes, on the people who pay tax. And low interest rates, and controls on banks lets them create other invisible taxes. There's also a big difference between the rules, and what is regularly enforced, so people think they are very hands off, when they can be officious pricks at times. And criminals - drug dealers, thieves, etc. are punished very severely. But really, look at a street in China, and a street in the USA. See which one looks "freer".