The truth is that all inactivated Covid vaccines presents with low efficacy, no matter where it originated from. Only Bharat BioTech claims that they got the mix right that shows a high efficacy but currently waiting till the Phase III trial finishes.
However,
Valneva (French) are developing their version. This particular one
VLA2001 is the only COVID-19 vaccine candidate using whole inactivated virus.
So Valneva's vaccine is thought to produce a more broadly protective immune response. That is, antibodies and cells of the immune system are able to recognise and neutralise more pieces of the virus than just the spike protein.
As a result, Valneva's vaccine could be more effective at tackling
emerging COVID-19 virus variants and, if approved, play a useful role as a booster vaccine.
Given the above it's useless arguing...