1080 medium is the cleanest one. narrow is too tight of a shot, wide is all fisheye looking. the best way though is to put it on a gimble, then most of the fisheye goes away and you can get some wider angles. I like flying low and i like the wider look when the ground goes by.....
heres a few examples
1080p med
these were all filmed in 960 then cropped to 720p. The smooth views were a tilt gimble in a fpv quad, the rougher ride is a wing bouncing around in the wind no gimble, but doesn't have to pitch forward to go like a multi
straight raw 960, i use it cause the fpv bit, without a gimble it shows the top better when i tilt forward
another fisheye city
they just don't do it the best...... theres alot of options coming out soon that i bet take over the GP role. At least give it some competition
EDIT: was just looking the post over and you don't even have to hit play to see fisheye, or not, just looking at the previews