"From what I have read, the Pfizer gives the best over all protection".... me thinks you answered your own question if peace of mind is all you need. .
For the rest of us... if only one option is offered... take it. The only issue is after the first vaccine shot, if possible wait the 12 to 15 weeks for the second shot. There is evidence that the efficacy, particularly of the AstraZenaca vaccine, is significantly higher simply by spacing the two shots out over 12 to 15 weeks.. You might be told to do that in any event...
Not a doctor de Mort.