Do you intend to get a COVID-19 vaccination? If so, do you have a preference for the Pfizer or Moderna?(or other?) Both seem very effective.
I plan to get one as soon as its available to me. If I get to choose, I'd prefer the Moderna vax, but will take whatever is available first. The reason I'd prefer Moderna is there seems to be less to go wrong in the handling and preparation of it. By wrong I just mean reducing effectiveness. I know several people who've gotten at least one dose of the Moderna vaccine already, and so far the most severe side effect has been a mildly sore arm where they received the shot. Anecdotal I know.
The Pfizer one has less time between doses. They also have a much longer history as a company. After all, it was Pfizer over two decades ago that created the little blue pill allowing dead men to rise again.