Interlaced footage is reliant on the "frames" on either side of it to create a picture. It is also a carry over format from analogue television transmissions. Please Google and look up more details on interlaced footage.
I record to the maximum my computer can handle comfortably and which I can edit. I record in progressive mode and I do this because it produces the best "cut" and "merge" video. The frames are not reliant on any either side.
Where the occasion demands I opt for 60fps to capture a particular scene. In general 30fps at 1080p is my choice. however if I have cause I can video crop scenes to 720 (zoom) without noticeable TV loss of quality or for use in streaming.
The answer is of course, experiment and see what your PC can handle.
Dafydd