A large study using world bank data analyzing the quality of life in Capitalist vs Socialist countries and finds overwhelmingly at similar levels of development with socialism bringing better quality of life:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1646771/pdf/amjph00269-0055.pdf
This study compared capitalist and socialist countries in measures of the physical quality of life (PQL), taking into account the level of economic development.
Finally, it's informative to look at what people who lived under communism feel now that they got a taste of capitalism have to say now.
https://www.pewresearch.org/fact-tank/2010/04/28/hungary-better-off-under-communism/
https://web.archive.org/web/20210825152314/http://www.balkanalysis.com/romania/2011/12/27/in-romania-opinion-polls-show-nostalgia-for-communism/
https://www.spiegel.de/international/germany/homesick-for-a-dictatorship-majority-of-eastern-germans-feel-life-better-under-communism-a-634122.html
https://balkaninsight.com/2010/12/24/for-simon-poll-serbians-unsure-who-runs-their-country/
https://www.themoscowtimes.com/2020/03/24/75-of-russians-say-soviet-era-was-greatest-time-in-countrys-history-poll-a69735
Finally, it's informative to look at what people who lived under communism feel now that they got a taste of capitalism have to say now.
https://www.pewresearch.org/fact-tank/2010/04/28/hungary-better-off-under-communism/
https://web.archive.org/web/20210825152314/http://www.balkanalysis.com/romania/2011/12/27/in-romania-opinion-polls-show-nostalgia-for-communism/