There is still a lot not yet certain about any of the vaccines as the trials were only looking at some things,
We know with a reasonable degree of certainty that they are all safe.
Based on mild symptoms the RNA vectored vaccines appear better.
All the vaccines appear good at preventing more serious Covid, however the numbers in the placebo groups becoming seriously ill mean the certainty of the size of the effect is not there.
There is some evidence to suggest they should reduce transmission though again certainty is not there,
However they all genuinely appear to work and work fairly well and may all work very well indeed but we canot as yet be certain.