I'm rotating vaccines, and also alternating between viral vector vaccines and mRNA/protein vaccines.
Since I started off with Moderna last spring, I got a Johnson & Johnson booster this fall. Next spring I'll get Novavax if they are on the market by then, otherwise I'll do Pfizer in the spring.
I had the hardest time finding someone who would give me a Johnson & Johnson booster. Even if they had it available, they would insist that I should stay with Moderna. In order to get it I finally had to search out a place that had Johnson & Johnson only
and none of the others.
So much for the customer always being right.