Bob, I will share what works for us:
Being 'old-school', I stay with Frequency-based as much as I can - Daily and Weekly are configured as Frequency and Monthly and Yearly as Calendar-based.
Example of how we do this:
Weekly (frequency-based) schedule has open window from Sat 19:00 - Sun 15:00.
Monthly (calendar-based) schedule configured for every last Saturday of the month with open window Sat 18:50 - Sun 15:00.
The 10 minutes 'head-start' is my way of ensuring that only the Monthly will kick off. Weekly will be skipped as another Full within same policy is already running.