China's unprecedented generational explosion into the middle class happened only after Deng Xiaoping instituted market reforms. Economically, China is certainly more socialist than the west, but far more capitalist than it was in the 1970's.
There was a massive drop in living standards in the former Soviet Union after the introduction of capitalism in the 90es. Average life expectancy dropped something like 10 years, corresponding to millions of dead.
Most communists and socialists will refer to both the USSR and China as capitalist projects on accelerated timelines. They were trying to speed-run from feudalism, through capitalism, to communism.
At least that's what comes up when you mention the problems that these countries have.