Traditional vaccines and mRNA injections create a different mix of antibodies, which have different risks of facilitating infection. Pfizer says their injections cause creation of antibodies to the spike protein.
According to the research I have read, the spike proteins are more likely to mutate and make MRNA vaccine antibodies ineffective. That certainly seems to be the case now with the return to masking for the vaccinated.
One of the reasons why natural immunity lasts longer and provides better protection than the MRNA vaccines is that you aren’t just directing the immune system at one protein.
Of course the “traditional” COVID vaccine in development (novavax) is also only targeting the spike protein as well. It will still likely be much safer as you are actually injecting the protein rather than tricking the body into making it, but it probably won’t provide any better protection.