@sue16833 and @sueinmn -- My PMR is in remission and I've had both Pfizer vaccines. I found an article on a rheumatology blog by a doctor that mentions that he recommends Pfizer for his patients and family if it's available.

"The Pfizer-BioNTech COVID-19 vaccine is administered as an intramuscular injection on day 0 and again on day 21. The full benefit from the vaccine occurs 2 weeks after the second injection.

This vaccine is not a live virus vaccine and can be given to immunocompromised patients, including patients on immunosuppressant therapy (examples include prednisone, methotrexate, and biologic DMARDs). However, currently available data does not establish safety and efficacy in immunocompromised patients. It is possible that the vaccine may not be as effective in immunocompromised patients. I recommend that my patients receive this COVID-19 vaccination when it is available locally, but continue to practice social distancing, wearing masks, and frequent hand washing." --- Rheumatology Solutions > Blog > Pfizer-BioNTech COVID-19 Vaccine: https://www.arthritis-sa.com/blog/pfizer-biontech-covid-19-vaccine

Here's some info that's hard to read but seems to agree that it's OK for prednisone/PMR -- Recommendations and Guidance for Steroid Injection Therapy and COVID-19 Vaccine Administration from the American Society of Pain and Neuroscience (ASPN): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7944369/