This weekend, my school is having a big event for teachers and their relatives with qualifying medical conditions to get the J&J vaccine. About half of the teachers who already got vaccinated elsewhere got the first dose of Pfizer while very few got Moderna. (For some reason, Pfizer is a lot more popular at CVS and Walgreens, and our local mass vaccination site.) I am interested in J&J because it's just one dosage. If you already got the vaccine, which one did you get? Did you have a preference or just went with whichever one was most readily available?