Good explanation, and accurate. My own PCA church and its presbytery are very conservative and we have maintained traditional worship services. As a whole, I would agree that OPC is slightly more conservative from stem to stern, but it’s less than one-sixth the PCA’s size and therefore not always an option. I know many discerning people who have happily belonged to both in the course of their career relocations. PCA is the endorsing agency for OPC and ARP military chaplains in addition to our own.
Amen, brother! (or sister, as the case may be) :-)