This article seems to indicate that the Johnson & Johnson vaccine should not be the first choice, if others are available to you.
Also, the latest estimate by the World Health Organization (WHO) is that
15 million people have died from COVID-19, but the predicted deaths in China are actually lower than expected (the excess being COVID related deaths) by the information made available by that country. (There is a link in the article to the WHO spreadsheet showing the data used. The cumulative excess as of December 2021 for China is approximately -52,000, up from a maximum of approximately -309,000, and the only months in which China had excess deaths are January and February of 2020.)
Actually,
this article discussing which country has the most COVID-19 deaths is better, with graphs. (Again, China is noticeably absent.)