mRNA vaccines are very quickly designed, tested and mass produced, which helps a lot in a pandemic like the one we had in 2020, preserving lives that could be taken away without the vaccine as prevention.However, the side effects are worse than the conventional vaccines, and some people think that they can even be deadly. Also, storage and transportation require fastidious temperatures, rendering it substantially inaccessible to a country like India.
I hope this helps
Am sorry English is my second language;)