This is personal opinion, but digital zoom has a very limited usefulness. It can be great for operating in a SAR environment where the operator can zoom in on an area without putting the aircraft in jeopardy or out of VLOS. The other use is similar and is to zoom in on a subject to insure it is in the frame before returning to 1X to make the actual shot. Digital zoom is the same as doing it in post processing, but in post you have much greater control.
If both cameras are free from gimbal buzz and work with your SD cards, you may want to leave them as they are.