Since the Op has been shooting for a long time I assume he's not a young guy and most likely quite accustomed to MOA scopes.
I had a heck of a time making the transition from MOA to MILS and eventually gave up and sold my MIL based IOR and I'm back to FFP in MOA.
From my experience you do not want to mix MILS and Minutes, just pick one and run with it for all your rifles.... especially if you hop between F-Class and PRS.
If you have any reservations about adjusting from MOA to MILS then don't.
Just because MILS are more popular in PRS is not a good enough reason for anyone to recalibrate 20 or 30 years of MOA shooting experience.
If you are not accustomed to either MILS or MOA, then for PRS just go with MILS and you'll fit right in.