Which Blackmagic codec to choose?
I would suggest using Braw Constant Quality Q5.

With 21-58MB/s it is on the lower end of data consumption while still giving you RAW capability.

BRAW gives you the RAW capabilities like Blackmagic Highlight recovery, changing the ISO, lossless color temperature changing. And 12bit colors.

ProRes gives you higher compatibility (Braw is currently only supported by Resolve) and "only" has 10bit Color.