Early on Moderna was distributed preferentially to areas that didn't have as adequate logistics for the more sensitive Pfizer. Rural Alaska, where I got my first shot in Feb, was mostly Moderna, especially in outlying areas. The vax clinic I went to was set up in a school Gym more than 70 miles from the nearest medical facility and was only Moderna. If I would have wanted Pfizer, I would have had to drive about 80 miles. I got my second dose of Moderna a few days late for the 28 day schedule, so maybe that was good .
I'm going in tomorrow for a nasal swab. A bit of bad personal news is that my 89 yo mother (fully vaxxed with Pfizer) came down with Covid two weeks ago and spent 5 days in the hospital. Of all my siblings, I was elected to be the one to get her released from the hospital and look after her until she was good to be on her own. I've taken precautions but probably was exposed starting 10 days ago. According to the Dr. who treated my mother, it would be very unusual for her to be infectious more than 10 days after presenting symptoms. I never displayed the slightest symptom, but other than my age, I have no indicated predispositions so it wouldn't be surprising that I could be asymptomatic. I actually would like to find out I was asymptomatic positive, as from my reading, Covid + vax >> vax + booster as far as immunity. I'll get the booster, but am not looking forward to it, I had a rather severe reaction to my second jab.
My brother's MIL is also currently recovering from Covid. She turns 100 next month. Both she and my mother very likely owe their lives to the vaccine. When I picked my mom up from the covid ward, the next room had a 34 yo apparently healthy unvaxxed man die of Covid that morning. All just anecdotes, but Covid is the real deal.