IMO, offer the PFD to the one who is reporting on your credit report. If you pay the OC, or if the OC accepts a PFD, the CA can still report on your CR with just as much damage as a paid vs. an unpaid debt.
I would PFD the CA for 100% of the amount owed. Yes, some have had success with a settlement and also has success in deleting it. However, DW was burned on a PFD of sorts (not like the PFDs drafted in here) we did many years ago with a JDB. They accepted the PFD and the money and did stop reporting. Unfortunately, they sold it to another JDB for the balance owed. Since then, I am certain that a CA's word is not their bond.
Others have also posted success with a PFD, but the CA never deleted as promised.