COVID-19 vaccine of Regeneron or China vaccine, which do you think is effective?

Whether a vaccine (including therapy and drugs) is effective and safe depends not entirely on which country produces it, let alone patriotism, but on the results of clinical trials (not clinical observation trials, but double-blind controlled trials). Vaccines listed in China are not qualified if they are rushed to the market without even doing (or possibly completing) the Phase III clinical trial, because many data are incomplete and the conclusions will not be reliable.