I would start with a couple of grass zones and see how the schedule behaves. If I had to guess I think most of the watering time was your drip system (depending on crop type). With that setup the system will water deeper, but less frequently.
Flex monthly waters at a set interval each month, and the intervals change throughout the year automatically. Flex daily is dynamic every day(!) and will only water when the zone is depleted (based on the moisture graph).
I'd try out a couple of zones first (preferably grass) and get that dialed in before using on the rest of the yard.
Here is some more information condensed with all important flex daily.
Hope this helps!