In Western NC the distribution system seems to favor PFE. In the Eastern part more MRNA.
I attribute part of the MRNA effect in the Eastern part to be linked to UNC as a distributor. Where UNC was one of the test sites for the MRNA vaccine.
For the most part there has been little difference in the PFE, and MRNA vaccines. Maybe that comes later with the variants.
I'm a little surprised J&J distribution didn't come out of the gate roaring. Given J&J's size, and experience.