Novavax is a protein subunit vaccine, with the spike protein only. The Chinese CoronaVac and Indian Covaxin are traditional inactivated virus vaccines.
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... Does that mean that CoronaVac and Covaxin might eventually prove better than current vaccines widely available in the US?
That seems very unlikely. If a variant evolves that has significant evasion of the vaccines, then we should be able to retool the mRNA vaccines quickly. And T-cell response is more robust to antigenic drift than the antibody response, though not as well studied. See [1] for a very detailed investigation into antigenic drift and vaccine evasion.