Abortion is far more serious. Abortion always directly ends a human life. Not getting vaccinated creates at most an indirect increase in the probability of other people getting sick and dying—probably a minuscule fraction of one life. Many decisions we make every day have similar statistical effects—taking an international flight which kills people through pollution, or buying products the production of which creates heavy metal poisoning in third world countries.
What is the incremental increase in covid deaths attributable to one person choosing not to get vaccinated, accounting for the fact that vaccination decreases but doesn’t eliminate the chances of passing on covid? What’s that compared to the incremental deaths caused by other activities?